topic 1 lesson 3

Question 1

why is helium a safer choice for airship than hydrogen

Answer 1

Hydrogen is reactive and helium is not bc its a noble gas

Question 2

most of the objebt around us are ________

Answer 2

compound elements

Question 3

___________ substances hat from when atoms from two or more elements bond together

Answer 3

compound

Question 4

In order to learn abt bonding you must first understand

Answer 4

Valence electrons

Question 5

The electrons of an atom can be found in different ______ _______

Answer 5

energy levels

Question 6

the first level is the one _______ to the nucleus

Answer 6

closest

Question 7

how many electrons can the first layer hold

Answer 7

2

Question 8

how many electrons can the second layer hold

Answer 8

8

Question 9

what is a valence electron

Answer 9

the electrons with the most enery levels

Question 10

how many valence electrons can an atom have

Answer 10

1–8

Question 11

in a dot diagram what does each dot represent

Answer 11

a valence electron

Question 12

what is the max number of valence electrons

Answer 12

8

Question 13

what element has an exception

Answer 13

Helium

Question 14

within a _________ have the same number of valence electrons

Answer 14

group/family

Question 15

How many valence electrons do Alkali Metals have

Answer 15

1

Question 16

how man valence electrons do Alkaline earth metals have

Answer 16

2

Question 17

how many valence electrons do Boron family have

Answer 17

3

Question 18

how many valence electrons do Carbon family have

Answer 18

4

Question 19

how many valence electrons do nitrogen family have

Answer 19

5

Question 20

how many valence electrons do oxygen family have

Answer 20

6

Question 21

how many valence electrons do Halogens have

Answer 21

7

Question 22

how many valence electrons do Noble gases

Answer 22

8

Question 23

_______ is the speed ad ease with which an element combines

Answer 23

reactivity

Question 24

Reactivity is based on the interactions of valence ________

Answer 24

electron

Question 25

usually metals have _____ to _____ valence electrons

Answer 25

2 to 3

Question 26

a material that can be harmmered or rolled into sheets

Answer 26

malleable

Question 27

material that can be pulled out or drawn into wires

Answer 27

ductile

Question 28

ability of an object to transfer heat or electricity

Answer 28

conductive

Question 29

which properties identity an object as an example

Answer 29

copper bowl, copper wire, and silver

Question 30

A rare physical property of metals is

Answer 30

magnetism

Question 31

nonmetals can react with metals and _______

Answer 31

metalloids

Question 32

Poor _________ of electricity and heat

Answer 32

conductivity

Question 33

solid nonmetals are _________ and dull

Answer 33

brittle

Question 34

what state are most nonmetals in at room temperature

Answer 34

gas

Question 35

metalloids are _______ at room temperature

Answer 35

solid

Question 36

what is the most common metalloid

Answer 36

silicon

Question 37

what is a metalloid's most useful property

Answer 37

ability to conduct electricty

Question 38

what is a semiconductor

Answer 38

it can conduct electricty current under some condidtions

Question 39

what are semiconductors used for

Answer 39

computer chips.