Atoms MCQs with Answers

Orbitals having n + l = 4 are _?

• A.2p
• B.4s
• C.3d
• D.3p

What is the mass of an electron?

• A.9.109 × 10⁻³¹ kg
• B.1.673 × 10⁻²⁷ kg
• C.1.675 × 10⁻²⁷ kg
• D.9.109 × 10⁻²⁸ kg

Which of the following orbitals have a dumbbell shape?

• A.s orbital
• B.p orbital
• C.d orbital
• D.f orbital

Past Paper MCQ

Atomic number of hydrogen is:

• A.0
• B.2
• C.1
• D.3

In 1926, Schrodinger proposed model for structure of atom called _?

• A.Quantum model
• B.Plum pudding model
• C.Nuclear model
• D.Planetary model

The value of the enthalpy change for the process represented by the equation Na(g) → Na⁺(g) + e⁻ is equal to ?

• A.The electron affinity of sodium
• B.The first ionization energy of sodium
• C.The electronegativity of sodium
• D.The lattice energy of sodium

What is the mass of same number of potassium atoms as are present in 11.5 grams of sodium?

• A.11.5 g
• B.23 g
• C.39 g
• D.19.5 g

Which orbital has the lowest energy?

• A.1s
• B.2s
• C.3s
• D.2p

Elements which have same number of Neutrons are called as:

• A.Isotopes
• B.Isobars
• C.Isotones
• D.Isomers

The symbol for an atom of strontium is ⁹⁰₃₈Sr. What is the neutron number of the atom?

• A.38
• B.128
• C.90
• D.52