Chapter 5 Test

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1

What are the electrons that have the highest energy level and held the most loosely?

valence electrons

2

What is a representation of an atom's valence electrons that uses chemical symbols and dots?

electron dot digram

3

Most atoms are less likely to react with other atoms when they have how many valence electrons?

eight

4

What is the force of attraction that holds two atoms together as a result of the rearrangement of electrons between them?

chemical bond

5

As the atomic number increases, what happens to the number of valence electrons?

They increase.

6

Halogens are very reactive because they contain how many valence electrons?

seven

7

The most stable elements in the periodic table are found in the family of?

Inert/Noble gases

8

A group of elements share the same number of?

valence electrons

9

What is an atom or group of atoms that has an electric charge?

ion

10

What are ions that are made of more than one atom?

polyatomic ions

11

An attraction between two oppositely charged ions(positive and negative) is known as what?

ionic bonds

12

NaCl is an example of what?

chemical formula

13

A compound that consists of positive and negative ions is called what?

ionic compound

14

A what tells you the ratio of elements in the compound?

subscript

15

What are properties of ionic compounds?

hard, brittle, solids with high melting points, conduct electric current when melted or dissolved in water

16

The chemical bond formed when two atoms share electrons is called what?

covalent bonds

17

What is a neutral group of atoms joined by covalent bonds?

molecule

18

What force holds atoms together in a covalent bond?

the attraction of each atom's nucleus for the shared pair of electrons

19

When two atoms share two pairs of electrons, what is formed?

double bond

20

What is a compound composed of molecules?

molecular compound

21

When two atoms share three pairs of electrons, what is formed?

triple bond

22

A covalent bond in which electrons are shared equally is called a?

nonpolar bond

23

A covalent bond in which electrons are shared unequally is called what?

polar bond

24

What properties describe molecular compounds?

lower melting and boiling points, do not conduct electric current when melted or dissolved in water

25

What is an alloy?

a mixture of two or more elements at least one of which is a metal

26

What is a metallic bond?

an attraction between a positive metal ion and the many electrons surrounding it

27

Metals are easy to bend because...

metal ions can be pushed out of position

28

How does an atom become a positive ion?

it loses an electron

29

How does an atom become a negative ion?

it gains an electron

30

How is an ionic bond different from a covalent bond?

Ionic bonds transfer electrons. Covalent bonds share electrons.