group 1,7,0 periodic table GCSE WJEC

Where is group 1 found in the periodic table

Far left hand side

What is group 1 known as

Alkali metals

Name the first 3 alkali metals

Lithium Li, Sodium Na, Potassium K

What is a Group

A group tells us how many electrons are in an atoms outermost shell

What is a period

The period number tells us how many shells are occupied

What happens to the reactivity as you go down group 1 and why

Reactive to Group 1 increases as you move down the group because they lose need to lose one electron to gain a full outer shell and the distance between the nucleus and the outer electron shell increases. This means it’s easier to lose the outer most electron because it’s held less tightly by the positive nucleus.

What are the rules for drawing electronic structure

Electrons to be spaced out clearly and effectively.

First shall have maximum two electrons

Electrons to be drawn with x’s

Every shell after can hold up to 8 electrons

Electrons fill shells from the nucleus out can be used when previous is full

Electrons orbit the nucleus in electron shells

What are isotopes

When an atom has a different number of neutrons, it becomes an isotope. The element remains the same because it has the same number of protons.

Formula for relative atomic mass

Ar= total mass of all atoms of element

Total number of atoms of that element

What are Ions

Ions are charged particles when elements lose or gain electrons they form ions which are positively or negatively charged

Properties of metals

High boiling/melting points

A conductor of electricity

Shiny

High density

Malleable and ductile

Solid

Properties of nonmetals

Gases

low melting points

can’t conduct electricity insulator

can’t conduct heat

Low density

What are elements?

Elements are substances that own that are only made up of one type of atom. I cannot be broken down into anything simpler.

What are compounds?

Compounds are substances that have more than one type of atom chemically bounded to each other

What are mixtures?

Mixtures are two or more substances going together that can be easily separated

What is filtration

What happens to the reactivity as you go down group 7 and why ?

The reactivity in group 7 decreases as you go down the group because distance between the nucleus and the outer shell increases this means it’s harder to gain an electron because there is less pull from the positive nucleus.