group 1 (alkali metals) (C3)

Question 1

how many electrons does the element have in its outer shell?

Answer 1

1 electron

Question 2

what colour do the elements turn universal indicator?

Answer 2

purple

Question 3

what 4 things happen the further down the group you go?

Answer 3

• reactivity increases
• atom size increases
• boiling point decreases
• melting point decreases

Question 4

why is it easier to loose electrons than gain electrons?

Answer 4

because of the shielding effect of other electrons

Question 5

what is there less of in these elements?

Answer 5

electrostatic force

Question 6

What are the first 3 elements in this group? (in order going downwards)

Answer 6

Lithium (Li)
Sodium (Na)
Potassium (K)

Question 7

how do the elements react with water (which are less dense)?

Answer 7

vigorously

Question 8

When reacted with water what are the 2 products?

Answer 8

hydrogen and metal hydroxide

Question 9

What is the word equation when lithium is reacted with water?

Answer 9

lithium + water -> hydrogen + lithium hydroxide

Question 10

What is the balanced symbol equation for when lithium is reacted with water?

Answer 10

2Li (s) + 2H^2O (l) -> H^2 (g) + LiOH (aq)

Question 11

what density do all the elements have?

Answer 11

a low density

Question 12

which elements are less dense than water?

Answer 12

the first 3 (lithium, sodium, and potassium)

Question 13

what do the elements react with?

Answer 13

non metals?

Question 14

when reacting with non-metals what kind of compounds are formed?

Answer 14

ionic compounds

Question 15

what charge do the ionic compounds have?

Answer 15

+1

Question 16

what colour are the compound solids?

Answer 16

white

Question 17

when the compound solids are dissolved in water what colour is the solution?

Answer 17

colourless

Question 18

what happens the further down the group you go?

Answer 18

the more shells of electrons

Question 19

why do elements get more reactive the further down the group you go?

Answer 19

the layers of electrons shield the nucleus from reacting. the lone electron on the outer shell is further away from the nucleus. this means it becomes easier to loose an electron.

Question 20

what happens to reactivity as you go down the group?

Answer 20

it increases