Question

Element Y has a proton number of 7. It also has seven neutrons.
Deduce (i) the number of electrons in an atom of Y;(ii) the nucleon number of Y.
Represent Y by writing the chemical symbol, including the proton and nucleon number. ​

Answer 1

Answer:

i) no. of electons of the element Y is 7 ii) the no. of the nucleon no. of Y is also 7

Answer 2

ATOM -

• An atom is the smallest unit of matter.
• An atom consists of electrons that revolve around the nucleus.
• The nucleus is centrally located containing protons and neutrons.
• The atomic number is given by the number of electrons or protons in an atom.
• Atomic mass or nucleons number is the representation of the sum of protons and neutrons in the nucleus of an atom.
• An element is represented as - $X_A^Z$  where, X is the symbol of the element, Z is the atomic number, and A is the atomic mass.
• In the given element,

Given -

Protons - 7

Neutrons - 7

(i) Number of electrons = Number of protons

Therefore, number of electrons = 7

(ii) Nucleon number = Protons + Neutrons

Nucleons = 7 + 7 = 14

The element with atomic number 7 and atomic mass 14 is NITROGEN.

The chemical representation is -

                                                  $N^7_1_4$