Periodic Table

Question 1

An atom has the electron configuration of 2.8.7. What group of the periodic table is it in and how do you know?

Answer 1

7, it has 7 electrons in outermost shell

Question 2

What are the two types of elements?

Answer 2

Metals and non-metals

Question 3

Describe what the group number of an element tells us about its electron configuration

Answer 3

How many electrons it has in its outer shell

Question 4

Which property was used to order the elements in early versions of the periodic table?

Answer 4

Mass number

Question 5

Which property is used to order the elements in the modern periodic table?

Answer 5

Atomic number

Question 5

Why did Mendeleev leave gaps?

Answer 5

to place elements not known at the time

Question 6

What do all the elements in a group have in common?

Answer 6

Same number of electrons in outer shell

Question 7

What do all the elements in a period have in common?

Answer 7

Same number of shells

Question 8

Why are the elements in group 1 known as ‘alkali metals’?

Answer 8

When they react with water they produce an alkaline solution

Question 9

Describe what you see when lithium is added to water

Answer 9

Fizzing

Question 10

Write the symbol equation for the reaction of lithium with water

Answer 10

Li + H2O = LiOH + H2

Question 11

What is the mass of a neutron?

Answer 11

1

Question 11

What is the mass of a proton?

Answer 11

1

Question 12

What is the mass of an electron?

Answer 12

1/2000

Question 13

What is the radius of an atom?

Answer 13

10^-10m

Question 14

What two changes of state occur in
distillation?

Answer 14

Boiling, condensation

Question 15

What temperature would the
thermometer show when distilling
salt and water?

Answer 15

100°C

Question 16

As you go down group 1, the metals become more _________.
Their melting and boiling points _______.

Answer 16

reactive
decrease