Subatomic Particles MCQ Quiz - Objective Question with Answer for Subatomic Particles - Download Free PDF

CONCEPT:

Electron Configuration and the Bohr Model

• In atomic theory and quantum mechanics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.
• The Bohr model of the atom defines these shells and the maximum number of electrons that each shell can hold.
• The first shell, also known as the K-shell, can hold a maximum of 2 electrons.

EXPLANATION:

• According to the Bohr model, each shell is assigned a principal quantum number (n), with the first shell being n=1.
• The maximum number of electrons in a shell is given by the formula 2n².
• For the first shell (n=1):
  • Maximum number of electrons = 2(1)² = 2
• Therefore, the first shell can hold a maximum of 2 electrons.

Therefore, the maximum number of electrons that can occupy the first shell of an atom is 2.

The correct answer is 2) 1735X, 1737Y.

Key Points

• Isobars are atoms of different chemical elements that have the same number of nucleons.
• For two atoms to be isobars, they must have the same mass number but different atomic numbers.
• 1735X and 1737Y are not isobars because they have different mass numbers (35 and 37).
• The other pairs like 612X and 812Y, 48X and 58Y, 611X and 711Y are isobars as they share the same mass number but different atomic numbers.

Additional Information

• Isotopes
  • Atoms of the same element with the same number of protons but different numbers of neutrons.
  • They have the same atomic number but different mass numbers.
• Atomic Number
  • The number of protons in the nucleus of an atom.
  • It defines the chemical properties of the element and its position in the periodic table.
• Mass Number
  • The total number of protons and neutrons in an atom's nucleus.
  • It is represented by the symbol A.
• Nucleons
  • Protons and neutrons in the nucleus of an atom.
  • The sum of nucleons gives the mass number of an atom.

The correct answer is Neutrons and Protons.

• The protons and neutrons collectively present in the nucleus of an atom are called nucleons.
• The nucleons occupy a very small space inside the nucleus.

Key Points

• Neutron is a neutral subatomic particle that is Constitute of every atomic nucleus except ordinary Hydrogen. It has no and a rest Mass equal to 1.67493 × 10⁻²⁷ kg marginally greater than that of the Proton but nearly 1,839 times greater than that of the Electron.
• Neutrons and protons, commonly called Nucleons are bound together in the dense inner core of a nucleus, they account for 99.9 per cent of the atom’s mass.

Additional Information

• Proton stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10⁻²⁷ kg, which is 1,836 times the mass of an electron.
• Electron, the lightest stable known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10⁻³¹ kg, which is only ¹/_1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.

The correct answer is Neutrons and Protons.

• The protons and neutrons collectively present in the nucleus of an atom are called nucleons.
• The nucleons occupy a very small space inside the nucleus.

Key Points

• Neutron is a neutral subatomic particle that is Constitute of every atomic nucleus except ordinary Hydrogen. It has no and a rest Mass equal to 1.67493 × 10⁻²⁷ kg marginally greater than that of the Proton but nearly 1,839 times greater than that of the Electron.
• Neutrons and protons, commonly called Nucleons are bound together in the dense inner core of a nucleus, they account for 99.9 per cent of the atom’s mass.

Additional Information

• Proton stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10⁻²⁷ kg, which is 1,836 times the mass of an electron.
• Electron, the lightest stable known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10⁻³¹ kg, which is only ¹/_1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.

CONCEPT:

Electron Configuration and the Bohr Model

• In atomic theory and quantum mechanics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.
• The Bohr model of the atom defines these shells and the maximum number of electrons that each shell can hold.
• The first shell, also known as the K-shell, can hold a maximum of 2 electrons.

EXPLANATION:

• According to the Bohr model, each shell is assigned a principal quantum number (n), with the first shell being n=1.
• The maximum number of electrons in a shell is given by the formula 2n².
• For the first shell (n=1):
  • Maximum number of electrons = 2(1)² = 2
• Therefore, the first shell can hold a maximum of 2 electrons.

Therefore, the maximum number of electrons that can occupy the first shell of an atom is 2.

The correct answer is Neutrons and Protons.

• The protons and neutrons collectively present in the nucleus of an atom are called nucleons.
• The nucleons occupy a very small space inside the nucleus.

Key Points

• Neutron is a neutral subatomic particle that is Constitute of every atomic nucleus except ordinary Hydrogen. It has no and a rest Mass equal to 1.67493 × 10⁻²⁷ kg marginally greater than that of the Proton but nearly 1,839 times greater than that of the Electron.
• Neutrons and protons, commonly called Nucleons are bound together in the dense inner core of a nucleus, they account for 99.9 per cent of the atom’s mass.

Additional Information

• Proton stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10⁻²⁷ kg, which is 1,836 times the mass of an electron.
• Electron, the lightest stable known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10⁻³¹ kg, which is only ¹/_1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.

CONCEPT:

Electron Configuration and the Bohr Model

• In atomic theory and quantum mechanics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.
• The Bohr model of the atom defines these shells and the maximum number of electrons that each shell can hold.
• The first shell, also known as the K-shell, can hold a maximum of 2 electrons.

EXPLANATION:

• According to the Bohr model, each shell is assigned a principal quantum number (n), with the first shell being n=1.
• The maximum number of electrons in a shell is given by the formula 2n².
• For the first shell (n=1):
  • Maximum number of electrons = 2(1)² = 2
• Therefore, the first shell can hold a maximum of 2 electrons.

Therefore, the maximum number of electrons that can occupy the first shell of an atom is 2.

The correct answer is 2) 1735X, 1737Y.

Key Points

• Isobars are atoms of different chemical elements that have the same number of nucleons.
• For two atoms to be isobars, they must have the same mass number but different atomic numbers.
• 1735X and 1737Y are not isobars because they have different mass numbers (35 and 37).
• The other pairs like 612X and 812Y, 48X and 58Y, 611X and 711Y are isobars as they share the same mass number but different atomic numbers.

Additional Information

• Isotopes
  • Atoms of the same element with the same number of protons but different numbers of neutrons.
  • They have the same atomic number but different mass numbers.
• Atomic Number
  • The number of protons in the nucleus of an atom.
  • It defines the chemical properties of the element and its position in the periodic table.
• Mass Number
  • The total number of protons and neutrons in an atom's nucleus.
  • It is represented by the symbol A.
• Nucleons
  • Protons and neutrons in the nucleus of an atom.
  • The sum of nucleons gives the mass number of an atom.