C2

Question 1

How did Mendeleev place elements his periodic table?

Answer 1

By atomic weight and the he arranged them so that a periodic pattern in their properties could be seen. He left gaps for elements that had notyet been discovered then used the table to predict what properties they should have.

Question 2

What are chemical elements placed in order with?

Answer 2

Atomic (proton) number.

This arranges the elements so that they line up in groups with similar properties

Question 3

What is the main difference between metals and non-metals

Answer 3

• Metals conduct electricity but non-metals are generally electrical insulators.
• in general, metals also have much higher melting and boiling points
• metals are malleable but non-metals are brittle

Question 4

How many electrons do noble gases have in their outer most shell?

Answer 4

• have full outer shell which makes them very stable and unreactive

Question 5

What are the properties of the alkali metals

Answer 5

• Very reactive
• Increase in reactivity as you go down the group
• low density
• soft

Question 6

Why have the Alkali metals got these properties?

Answer 6

Due to their electronic structure as they only have one electron in their outermost shell which makes them very reactive because they only need to lose one electron to get the stable electronic structure. Carry a 1+ charge

Question 7

What are the melting and boiling points of the Alkali metals?

Answer 7

They melt and boil at relatively low temperatures for metals. As you go down the group. The melting and boiling points get lower and lower.

Question 8

What are the Halogens ?

Answer 8

Group 7 and they are toxic non-metals

Question 9

Properties of the halogens

Answer 9

• Low melting and boiling point. Their melting points and boiling points increase going down the group
• poor conductor of heat and electricity.

Question 10

What charge do all halogen ions have?

Answer 10

Single Negative charge

Question 11

What is the result of diplacement reactions between halogens?

Answer 11

A morw reactive halogen will displace a less reactive halogen from solution of its salt

Question 12

What happens as you go down a group of electrons and the effects?

Answer 12

The number of shells increase by one per period.
Metals - larger atomes lose electrons easier
Non-metals - larger atoms gain electrons easily

Question 13

Why is it easier for larger atoms to lose electrons ?

Answer 13

Further away from the attractive force of the nucleus