How many isotopes has hydrogen?

A. 2

B. 3

C. 4

D. 5

Which of the following electrons configurations correctly represents an inert element?

A. 1s²2s²2p⁴

B. 1s²2s²2p⁶3s²

C. 1s²2s²2p⁶3s²3p⁴

D. 1s²2s²2p⁶

What type of reaction is represented by the following equation?$\frac{2}{1}$D$\frac{3}{1}$H → $\frac{4}{4}$He + $\frac{1}{0}$n + energy

A. Nuclear fission

B. Nuclar fusion

C. Radioactive decay

D. Spontaneous decay

Which of the following ions has the electron configuration 2,8,8?

A. Na⁺

B. Mg²⁺

C. F^-

D. CI^-

An element with the electron configuration of 1s ²2s ²2p ⁶ would have a combining power of

A. o

B. 2

C. 6

D. 8

Rare gases are stable because they

A. contain equal number of protons and neutrons

B. contain more electrons than protons

C. are chemically active

D. have octet structure

Which of the following elements would produce coloured ions in aqueous solution?

A. Calcium

B. lron

C. Magnesium

D. Sodium

The energy change that accompanies the addition of an electron to an isolated gaseous atom is

A. bond energy

B. electronegativity

C. electron affinity

D. ionization energy

Which of the following hydrohalic acids is the weakest?

A. HBr

B. HCI

C. HF

D. HI

Which of the following arrangements is in order of increasing metallic property?

A. Li < Na< k

B. Na < Li < K

C. K

D. K < Li < Na