1.7

Question 1

Atomic Radius

Answer 1

One-half the distance between the two nuclei in two adjacent atoms of the same element; this can vary according to interatomic forces

Question 2

Electron Affinity

Answer 2

Energy change associated with addition of an electron to a gaseous atom or ion

Question 3

Electronegativity

Answer 3

Tendency of an atom to attract electrons in a bond to itself

Question 4

Group

Answer 4

Vertical column of the periodic table

Question 5

Inert gas

Answer 5

Noble gas, element in group 18

Question 6

Ionization Energy

Answer 6

Energy required to remove an electron from a gaseous atom or ion

Question 7

Isoelectronic

Answer 7

Groups of ions or atoms that have identical electron configurations

Question 8

Main-group element

Answer 8

Representative element, element in groups 1, 2 and 13-18

Question 9

Metal

Answer 9

Element that is shiny, malleable, good conductor of heat and electricity

Question 10

Metalloid

Answer 10

Element that conducts heat and electricity moderately well, and possesses some properties of metals and some properties of nonmetals

Question 11

Nonmetal

Answer 11

Element that appears dull, poor conductor of heat and electricity

Question 12

Period

Answer 12

Horizontal row of periodic table

Question 13

Periodic law

Answer 13

Properties of the elements are periodic function of their atomic numbers