Which of the following scientists discovered the neutron?

A. Ernest Rutherford

B. J.J Thompson

C. James Chadwick

D. M illikan

How many protons does ⁴⁰20Ca contain?

A. 20

B. 30

C. 40

D. 60

If 100 atoms of element X contains 70 atoms of ⁹X and 30 atoms of ¹¹X, calculate the relative atomic mass of X

A. 9.6

B. 10.6

C. 11.6

D. 20.0

Consider the reaction represented by the equation: ²³⁸₉₂U + ¹₀ → ¹³⁹ ₅₆Ba + ⁹⁴ ₃₆Kr + 3¹ ₀n. The reaction represents a

A. nuclear fission

B. nuclear fusion

C. radioactive decay

D. spontaneous disintegration

How many orbitals are associated with the p-sub energy level?

A. 2

B. 3

C. 5

D. 6

Which of the following elements has the electronic configuration:1s²2s²2p⁶3s²3p¹? [₁₁Na, ₁₃A1,
₁₄N,₁₆S]

A. Al

B. Na

C. N

D. S

The following properties are characteristics of transition elements except

A. formation of complex ions

B. fixed oxidation states

C. formation of coloured compounds

D. catalytic abilities

Which of the following ions is isoelectronic with neon? [₃Li, _{3F, 10Ne, 17CI,19K]}

A. CI^-

B. F^-

C. K⁺

D. Li,⁺

Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

A. 1s² 2s² 2p²

B. 1s² 2s² 2p⁶

C. 1s² 2s² 2p⁶ 3s² 3p⁴

D. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

An element Q forms a compound QCI₅. In which group of the periodic table is Q?

A. l

B. lll

C. V

D. VII

Which of the statements about the behaviour of the atom is correct?

A. atomic size decreases down the group

B. atomic size increases across the period

C. anions are smaller than the parent atom

D. cations are smaller than the parent atom