Chapter 2 (Elements and Compounds)

Question 1

atomic mass unit

Answer 1

• u
• 1/12 the mass of a carbon atom that has 6p and 6n
• used bc the ACTUAL mass is very small

Question 2

ion

Answer 2

• unequal number of protons and electrons

- has overall positive or negative charge

Question 3

cation

Answer 3

ion w/ more protons therefore has an overall positive charge

Question 4

anion

Answer 4

ion w/ more electrons therefore has an overall negative charge

Question 5

atomic number

Answer 5

• Z

- number of protons in the nucleus

Question 6

mass number

Answer 6

• A

- the number of protons and neutrons

Question 7

atomic symbol

Answer 7

the letter symbol that represents the element

Question 8

isotopes

Answer 8

atoms that have the same atomic number(z) but different mass numbers (A)

Question 9

atomic weight

Answer 9

• the average mass of all naturally occurring isotopes of an element
• takes into account the relative abundance of the isotopes

Question 10

percent abundance

Answer 10

percentage of abundance of the all the isotopes for a given element.

Question 11

periodic table groups

Answer 11

vertical columns

Question 12

periodic table periods

Answer 12

horizontal rows

Question 13

alkali metals

Answer 13

Group 1A

Question 14

halogens

Answer 14

Group 7A

Question 15

alkaline earth metals

Answer 15

Group 2A

Question 16

noble gases

Answer 16

Group 8A

Question 17

Group A elements

Answer 17

main group elements/representative elements

Question 18

Group B elements

Answer 18

transition metals

Question 19

Chalcogens

Answer 19

6A

Question 20

number of periods in the periodic table

Answer 20

7 periods

Question 21

allotropes

Answer 21

forms of the same element with different physical and chemical properties