Chapt 2.1

Question 1

nucleus

Answer 1

dense center of an atom

Question 2

proton

Answer 2

particle with a positive electrical charge

Question 3

neutron

Answer 3

particle with no electrical charge

Question 4

electron

Answer 4

particle with a negative charge

Question 5

Water (H2O) and carbon dioxide (CO2), are examples of (compounds/elements).

Answer 5

compounds

Question 6

(Elements/Compounds) are made up of only one type of atom.

Answer 6

Elements

Question 7

T or F: An atom becomes an ion when its number of protons changes.

Answer 7

false

Question 8

T or F: Some ions are positively charged, and some have not charge.

Answer 8

false

Question 9

T or F: The formation of an ion results in a full outermost energy level.

Answer 9

true

Question 10

T or F: Ions usually form when electors are transferred from one atom to another.

Answer 10

true

Question 11

Shared pairs of electrons fill the (innermost/outermost) levels of bonded atoms.

Answer 11

outermost

Question 12

Covalent bonds are generally very (strong/weak)

Answer 12

strong

Question 13

Two toms may form several covalent bonds to share several pairs of (protons/electrons)

Answer 13

electrons

Question 14

A molecule is held together by (ionic/covalent) bonds.

Answer 14

covalent

Question 15

compound

Answer 15

a substance made of atoms of different elements bonded tougher in a certain ratio

Question 16

element

Answer 16

a particular type of atom

Question 17

ionic bond

Answer 17

a bond formed by the electrical force between two ions of opposite charge

Question 18

covalent bond

Answer 18

a bond formed when two atoms share a pair of electrons

Question 19

atom

Answer 19

the smallest basic unit of matter

Question 20

molecule

Answer 20

two or more atoms held together by covalent bonds