Rumaisa 30/1/2023 8A
● Most common element in the universe
● Versatile (can be adapted for many different purposes)
● Colourless, tasteless, and non-toxic
● Highly combustible (able to catch fire and burn easily)
● Lightest element
● Found in water, plants, animals, and humans too
● It’s present in nearly all molecules in living things, but scarce in the atmosphere
, 1
Li-3, Na-11, K-19, Rb-37, Cs-55, Fr-87
Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
Good conductors of heat and electricity
Soft and can easily be cut with a knife
Have low densities
Very chemically reactive; usually form ionic compounds
Has one electron in its highest energy level
Because they only have one electron in their outermost shell
Producing soap, chemicals and textiles, including glass, ceramics, and metals.
They have extreme reactions with air and water, like turning black, exploding, catching fire,
and more, which is why they are usually stored in oil.
2
Be-4, Mg-12, Ca-20, Sr-38, Ba-56, Ra-88
Beryllium, Magnesium, Calcium, Strontium, Barium, Radium
Soft and silvery coloured
Low density metals
Melting points decrease with increasing atomic mass (except Mg)
Chemically reactive
Increasingly soluble with decreasing temperature
The outer electrons get further from the nucleus and become easier to remove, making it less reactive.
Manufacturing toothpaste, aiding in space exploration, and producing x-ray tubes.
These elements are usually quite expensive, don’t have many everyday uses, and are
quite reactive and radioactive.
● Most common element in the universe
● Versatile (can be adapted for many different purposes)
● Colourless, tasteless, and non-toxic
● Highly combustible (able to catch fire and burn easily)
● Lightest element
● Found in water, plants, animals, and humans too
● It’s present in nearly all molecules in living things, but scarce in the atmosphere
, 1
Li-3, Na-11, K-19, Rb-37, Cs-55, Fr-87
Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
Good conductors of heat and electricity
Soft and can easily be cut with a knife
Have low densities
Very chemically reactive; usually form ionic compounds
Has one electron in its highest energy level
Because they only have one electron in their outermost shell
Producing soap, chemicals and textiles, including glass, ceramics, and metals.
They have extreme reactions with air and water, like turning black, exploding, catching fire,
and more, which is why they are usually stored in oil.
2
Be-4, Mg-12, Ca-20, Sr-38, Ba-56, Ra-88
Beryllium, Magnesium, Calcium, Strontium, Barium, Radium
Soft and silvery coloured
Low density metals
Melting points decrease with increasing atomic mass (except Mg)
Chemically reactive
Increasingly soluble with decreasing temperature
The outer electrons get further from the nucleus and become easier to remove, making it less reactive.
Manufacturing toothpaste, aiding in space exploration, and producing x-ray tubes.
These elements are usually quite expensive, don’t have many everyday uses, and are
quite reactive and radioactive.
