Chemistry

Question 1

1Electron affinity is the energy change when

Hard

A. an atom loses an electron B. bonds break C. an atom gains an electron D. atoms combine

Question 2

2Group 1 elements are called the

Easy

A. halogens B. noble gases C. alkali metals D. alkaline earth metals

Question 3

3Elements in Period 2 have

Easy

A. two protons B. two electron shells C. two neutrons D. two valence electrons

Question 4

4Down Group 1, the reactivity of the alkali metals

Easy

A. drops to zero B. stays constant C. increases D. decreases

Question 5

5The most electronegative element is

Easy

A. oxygen B. chlorine C. caesium D. fluorine

Question 6

6The second ionisation energy of sodium is very high because

Hard

A. the second electron is removed from a full inner shell B. it has many protons C. the first electron is inner D. sodium is a gas

Question 7

7The energy needed to remove one mole of electrons from one mole of gaseous atoms is the

Easy

A. electronegativity B. lattice energy C. first ionisation energy D. electron affinity

Question 8

8Which element has the highest electronegativity?

Easy

A. chlorine B. fluorine C. oxygen D. sodium

Question 9

9Which element has the highest first ionisation energy?

Hard

A. neon B. hydrogen C. helium D. fluorine

Question 10

10Elements in Group 0 (18) are unreactive because they

Easy

A. have full outer shells B. are radioactive C. are metals D. have one electron