atomic structure

Question 1

what is an element

Answer 1

One type of atom, on its own or joined
to another atom of the same type.​

Question 2

what is an compound

Answer 2

Different types of atom joined by a
chemical bond.​

Question 3

what is a mixture

Answer 3

elements or elements and compounds not joined together

Question 4

what does it mean if the formula consists of 1 big letter and 1 little letter

Answer 4

its an element

Question 5

what does it mean if a formula consists of 2 big letters

Answer 5

its 2 elements

Question 6

what does each electron shell correspond to

Answer 6

an energy level

Question 7

what do all elements in a group have in common

Answer 7

the same amount of electrons in outer shell

Question 8

what do all elements within a period have in common

Answer 8

the number of shells

Question 9

what is the reason for a pattern of reactivity going down the group

Answer 9

atoms get larger so distance between nucleus and outer shell increases, this means she shielding increases which means its easier to loose electrons and harder to gain them, this means there will be a pattern in reactivity as you move down the group