Positive charge is carried by

1

(a)

X-rays

(b)

cathode rays

(c)

\(\gamma\)-rays

(d)

anode rays

\(\alpha\)-particle is made up of

1

(a)

2 electrons and 2 protons

(b)

2 protons and 2 neutrons

(c)

2 electrons and 2 neutrons

(d)

helium atoms

The atomic number of neon (Ne), magnesium (Mg²⁺), aluminium (Al³⁺ ) and phosphorus (P^3-) are 10, 12, 13 and 15 respectively.Select the odd species in terms of electronic configuration.

1

(a)

Ne

(b)

Mg²⁺

(c)

Al³⁺

(d)

P^3-

An atom containing 16 electrons and 16 neutrons is represented as

1

(a)

\(_{16}^{16}A\)

(b)

\(_{16}^{32}A\)

(c)

\(_{16}^{0}A\)

(d)

\(_{0}^{16}A\)

which one is not true of two isotopes?

1

(a)

similar mass number

(b)

similar atomic number

(c)

similar chemical properties

(d)

similar electronic configurarion

Substance having similar chemical properties, but different physical properties are called ______

1

(a)

isotopes

The negative particle discovered by J.J.Thomson was given name ........

1

(a)

electron

E.Rutherford used ............ particles in his scattering experiments

1

(a)

alpha

According to Rutherford, the force of attraction between the moving electrons and ............. is counter balanced by the centrifugal force of electrons.

1

(a)

nucleus

Almost all the mass of an atom is concentrated in a small region of space called ...........

1

(a)

nucleus

What are canal rays?

1

(a)