Question

The number of electrons, protons and neutrons of 5 elements are given below:Element: A B C D E , Electrons 4 18 17 11 17 Protons 6 18 17 9 17 Neutrons 6 22 20 10 18 a) Which of them is a cation?b) Which of them is an anion?c) Which is an atom of an inert gas?d) Write the electronic configuration of element A.e) What is the relation between C and E?Give reason for each. *

Answer 1

Answer:

a) cation A2

b) D is anion

c) B is an atom of an inert gas

d ) 1s22s22p63s23p6

e) Cand E are isotopes

Explanation:

Answer 2

Given:

Element A: 4e, 6p, 6n

Element B: 18e, 18p, 22n

Element C: 17e, 17p, 20n

Element D: 11e, 9p, 10n

Element E: 17e, 17p, 18n

Cations are ions with a positive charge (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons).

Here, element A has 4e and 6p thus a net charge of -4+6 = +2.

(a) ∴ Element A is a cation.

Anions are ions with a negative charge (meaning they have more electrons than protons due to having gained one or more electrons).

Here, element D has 11electrons and 9 protons, thus a net charge of -11+9 = -2

(b) ∴ Element D is an anion.

Inert gases have electronic configurations with a neutral charge and all orbitals ocupied.

Here, in Element B, we have 18 electrons and 18 protons thus a net charge of zero. Where as the 1s, 2s, 2p, 3s and 3p orbitals are completely occupied.

(c) ∴ Element be is an inert gas.

The nucleus, which includes protons and neutrons, is the most important structure in an atom. Electrons are around this nucleus.

Element A has 4 electrons, 6 protons and 6 neutrons.

(d) ∴ Electronic configuration of Element A will be 2 electrons occupying 1s and 2s orbitals each and 2 electrons having opposite spins and occupying 2p.

Isotopes are two or more types of atoms with the same atomic number but differing nucleon numbers due to varying numbers of neutrons in their nuclei.

(e) ∴ Element E and C have similar number of electrons, hene their atomic numbers are equal. Hence, C and E are isotopes.