Structure of Atom Test - 2

The following set of quantum numbers is possible for an electron in a 4f orbital:
n = 4
l = 3
m = -3, -2, -1, 0, 1, 2, 3
s = +1/2 or -1/2

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons. The addition of a neutron to the nucleus of an atom results in the formation of an isotope.

Each ion has 10 electrons

For F^-, Z = 9 A = 19 n = 10

For Na⁺, Z = 11, A = 23, n = 12

For Mg²⁺, Z = 12 A = 24 n = 12

For O^2-, Z = 8 A = 16 n = 8

The maximum number of 4f electrons, having spin quantum number 1/2 is 7.

The statement 'An s orbital is spherical in shape', means that the probability of finding an electron, at a given distance from the nucleus in this orbital, is same in all directions.

Electronic configuration of niobium (Nb = 41) is (Kr) 4d⁴, 5s¹

Electronic configuration of oxygen is 1s², 2s², 2p⁴. So six electrons have their spins paired in an atom of oxygen.

Atomic number = Number of electrons = Number of protons
Atomic weight = Number of protons + Number of neutrons
The number of electrons, protons and neutrons in an atom of this element will be, respectively, 24, 24 and 28

When electrons revolve in stationary orbits, there is no change in energy level.

Neurons are present in the nuclei of all elements, except the most common form of hydrogen.