What determines the radius of atomic orbitals, such as in B₁₂?

D. Principal quantum number (n²)

B. Azimuthal quantum number (l)

D. Principal quantum number (n²)

Everyday Science · Atoms, Elements & Compounds · page 8 of 30

Atoms MCQs with Answers

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Atoms MCQs (71–80)

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71.
Diameter of an atom is in the order of?
Correct Answer: A. 0.2 nm
One-liner
The diameter of an atom is in the order of 0.2 nm (nanometers).
72.
The smallest particle of an element that exhibits all the properties of the element is the ?
Correct Answer: B. Atom
One-liner
The smallest particle of an element that retains all the chemical properties of that element is the atom.
73.
The symbol that denotes the proton number is ?
Correct Answer: D. Z
One-liner
The proton number (atomic number) is denoted by the symbol Z.
74.
An atom has an atomic number 9 and a mass number 19. The number of neutrons present in its nucleus are _?
Correct Answer: B. 10
One-liner
The number of neutrons is calculated as mass number minus atomic number, so for this atom it is 10.
75.
Velocity of electron will be maximum in which orbit?
Correct Answer: A. 1st
One-liner
The velocity of an electron is maximum in the 1st orbit (K-shell), as it is closest to the nucleus and experiences the strongest electrostatic attraction.
76.
What determines the radius of atomic orbitals, such as in B₁₂?
Correct Answer: D. Principal quantum number (n²)
One-liner
The radius of atomic orbitals is determined by the principal quantum number (n²), as orbital radius is directly proportional to n².
77.
Bohr's quantum condition is _?
Correct Answer: C. mvr = nh/2π
One-liner
Bohr's quantum condition states that the angular momentum of an electron is quantized and given by mvr = nh/2π, where n is an integer.
78.
The mass number of Carbon is _?
Correct Answer: B. 12
One-liner
The mass number of Carbon is 12.
79.
Barium (Z = 56) has two electrons in the p-shell (valence shell). What is the maximum number of electrons in the penultimate shell i.e., the O-shell?
Correct Answer: B. 18
One-liner
The penultimate shell (O-shell) of Barium (Z=56) can hold a maximum of 18 electrons.
80.
Isotopes of an element are identical in ?
Correct Answer: A. Atomic number
One-liner
Isotopes of an element are identical in atomic number but differ in the number of neutrons.

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Atoms MCQs with Answers

Atoms MCQs (71–80)

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