Atomic Theory 1

Question 1

Element

Answer 1

Substance that cannot be broken down into simpler substances by chemical means

Question 2

Atomic number (above)

Answer 2

Number of protons present in the nucleus of an atom

Question 3

Mass number (not in periodic table)

Answer 3

Protons + neutrons in the nucleus of an atom

Question 4

Metal

Answer 4

Any element that loses electrons to form a positive ion

Question 5

Isotopes

Answer 5

Atoms of the same element that have the same atomic number ever different mass numbers

Question 6

Relative atomic mass number (Ar)

Answer 6

Average mass of an atom of an element compared to 1/12 the mass of the carbon - 12 isotope, taking relative abundance’s of the naturally occurring isotopes into account

Question 7

Relative molecular mass (Mr)

Answer 7

Average mass of a molecule of a compound compared to 1/12 the mass of the carbon-12 isotope, taking relative abundance’s of the naturally occurring isotopes into account

Question 8

Metal + oxygen =

Answer 8

Metal oxide

Question 9

Reactive metal (Grp 1/2) + H2O

Answer 9

Hydrogen gas + metal hydroxide

Question 10

How are elements arranged horizontally?

Answer 10

In periods

Question 11

How are elements arranged vertically?

Answer 11

In groups

Question 12

What does the number of electrons in the outer shell give rise to?

Answer 12

Valency

Question 13

Valency?

Answer 13

Number of chemical bonds an element can make

Question 14

Name of group 1

Answer 14

Alkali metals

Question 15

Name of Group 2

Answer 15

Alkaline earth metals

Question 16

Name of group 7

Answer 16

Halogens

Question 17

Name of group 0

Answer 17

Noble gases

Question 18

Valency of group 1

Answer 18

1

Question 19

Valency of group 2

Answer 19

2

Question 20

Valency of group 3

Answer 20

3

Question 21

Valency of group 4

Answer 21

(Usually) 4

Question 22

Valency of group 5

Answer 22

(Usually) 3

Question 23

Valency of group 6

Answer 23

(Usually) 2

Question 24

Valency of group 7

Answer 24

1

Question 25

Valency of group 0 (noble gases)

Answer 25

0

Question 26

Properties of alkali metals

Answer 26

- Extremely reactive | - React vigorously w/ water to form metal hydroxide + H gas

Question 27

Properties of alkaline earth metals (Group 2)

Answer 27

- Very reactive

Question 28

Properties of halogens

Answer 28

- Very reactive non metals

Question 29

Properties of noble gases

Answer 29

- Gaseous at RT | - Least reactive as they have 8e in outer shell

Question 30

Atoms

Answer 30

Single neutral units

Question 31

Molecules

Answer 31

Consist of 2 or more atoms, neutral

Question 32

Protons

Answer 32

Positively charged

Question 33

Neutrons

Answer 33

Neutral

Question 34

Electrons

Answer 34

Negatively charged

Question 35

Only metal that is liquid at room temp

Answer 35

Hg

Question 36

Non metal that is liquid at room temp (exists diatomically)

Answer 36

Br2