The atomic number of an atom is the ______.

(a)

Number of neutrons

(b)

Number of protons

(c)

Total number of protons and neutrons

(d)

Number of atoms

Nucleons comprises of _______.

(a)

Protons and electrons

(b)

Neutrons and electrons

(c)

Protons and neutrons

(d)

Neutrons and Positron

Protons and neutrons are called __________

(a)

atom

(b)

nucleons

(c)

positive charge

(d)

negative charge

Proton was discovered by _______________

(a)

Rutherford

(b)

Goldstein

(c)

Chadwick

(d)

J.J. Thomson

Lithium atom contains 3 protons and 4 neutrons Its atomic number is __________

(a)

4

(b)

3

(c)

5

(d)

7

What is the characteristics of proton?

Why neutrons called neutral particles?

What is an electron?

What is isotone?

In the notation of an atom _ZX^A. What does A & Z represent?

An atom of an element has no electron, will that atom have any mass or not? Can an atom exist without electron? If so then give example.

Find what is common salt? Name the elements present in it? Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.

Define isotopes? Give example.

Write any two postulates of Thomson's model of atom.

What makes atoms stick together?

What are the conclusions/observations made by Rutherford?

Explain the postulates of Dalton's atomic theory.