Question

True or False:

1. The energy of the electron in the 3d-orbital is less than that in the 4s-orbital in the hydrogen atom.

2. Hydrogen has two isotopes.

3. Nuclear reactivity of Na and Na⁺ is same.

4. Neutrons are better initiators of nuclear reactions than protons, deutrons or α-particles of the same energy.

5. ₆C¹⁴ and ₆C¹² have different chemical reactivity.

Answer 1

1. False

A 3d orbital has more energy than the 4s orbital but less than the 4p orbital.

2. False

Hydrogen has three isotopes: ₁H¹, ₁H² and ₁H³.

3. True

Because they have the same nucleus.

4. True

Neutrons are uncharged and hence they are not repelled by positively charged nucleus

5. False

They have same number of electrons and hence similar electronic configuration.