revision

Question 1

Isotope

Answer 1

have different number of neutrons but it is the same element

Question 2

Subatomic particles

Answer 2

protons, neutrons electrons

Question 3

charges of the subatomic particles

and its position in the atom

Answer 3

protons=positive-nucleus
neutrons=neutral-nucleus
electrons=negative-shells

Question 4

calcium and potassium

Answer 4

fill the third shell with 8 and begins filling the fourth shell

Question 5

groups

Answer 5

number of valence electrons

Question 6

periods

Answer 6

number of electron shells

Question 7

how many electrons do each shell hold?

Answer 7

shell 1-holds 2
shells 2-holds 8
shell 3-holds 18

Question 8

what do metals do in order to have a full outer shell?

Answer 8

they lose their valence electron to form a positively charged cation

Question 9

what do non-metals do in order to have a full outer shell?

Answer 9

gain electrons to form negatively charged anions

Question 10

what is the overall charge of an atom?

Answer 10

neutral

Question 11

what is the mass of an atom

Answer 11

protons + neutrons

Question 12

how to find the number of electrons in an atom

Answer 12

electrons=protons

Question 13

how to find the number of neutrons in an atom

Answer 13

mass number-protons

Question 14

for elements with 1-2 valence electrons group =

for elements with 3-8 valence elctrons group=

Answer 14

number of valence electrons

number of valence + 10

Question 15

what is true for all group 18 elements?

Answer 15

theyre outer shell is full hence why helium is found there

Question 16

what is an alloy?

Answer 16

a metal combined with a small amount of another metal

Question 17

what group are halogens?

Answer 17

group 17

Question 18

what group are alkali ?

Answer 18

group 1

Question 19

as you move down halogens what happens to the reactivity?

Answer 19

they become less reactive

Question 20

as you move down alkali what happens to the reactivity?

Answer 20

they become more reactive

Question 21

what are ions?

Answer 21

ions are atoms that have become charged through gaining or losing electrons in order to have a full outer shell

Question 22

when positive and negative ions are strongly attracted what is this called ?

Answer 22

ionic bonding

Question 23

how are polyatomic ions written

Answer 23

with two capital letters