Protons and neutrons are collectively called as ________

(a)

mesons

(b)

neutrino

(c)

Nucleons

(d)

Positrons

Atoms of the same element having same atomic number but different Mass number are called _________

(a)

Isotopes

(b)

Isobars

(c)

Isotones

(d)

Isotherm

The electronic configuration of Neon is 2, 8. So the valency is _________

(a)

2

(b)

8

(c)

0

(d)

10

Our bodies contain radioisotopes such as ___________which continuously emit radiation.

(a)

Potassium 40

(b)

Iodine 131

(c)

Cobalt 60

(d)

Carbon 14

Gay-Lussac law always dealing with________

(a)

Solids

(b)

Liquids

(c)

Gases

(d)

Semi-solids

Define an orbit.

What are nucleons?

Name the other particles present in the Nucleus of an atom.

An atom is electrically neutral. Why?

Calculate the number of electrons present in the third (M) and fourth (N) orbits

Calculate the atomic number of an element whose mass number is 40 and number of neutron is 20. Also find the name of the element.

Why do some isotopes show radioactivity? Give example.

Define Isotones with examples.

Assign the valency of magnesium and sulphur

Define quantum numbers

What is electronic configuration? Write the Bohr-Bury Rule of electronic configuration.

Write about quantum numbers.

What are isotopes? Write the isotopes of Hydrogen

Write the characteristics of fundamental particles