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Some elements are named after countries.
Atoms and Elements 04
Atoms and elements form the foundation of chemistry. In KS3 Science, students discover how these tiny particles create substances with unique properties and uses.
1 .
The following elements are named after countries except .......
Fr
Ge
I
Po
Fr Francium - France, Po Polonium - Poland, Ge Germanium - Germany. There are several more!! I is the chemical symbol for iodine, a dark purple solid that is a member of the group of elements called the halogens
2 .
The following elements are named after famous scientists except .......
curium
einsteinium
nobelium
uranium
Uranium was named after the planet Uranus
3 .
Which of the following is a halogen?
Argon
Fluorine
Helium
Neon
The halogens are coloured elements - fluorine (symbol F) is a yellow-green gas
4 .
Lithium floats on water as it .......
is a non-metallic element
is a solid
is less dense than water
is more dense than water
Lithium is a metal in group 1 of the periodic table, its atoms contain three protons
5 .
In the periodic table, the elements are arranged in order of increasing .......
alphabetical symbol
electron number
mass number
proton number
Also called the atomic number, it also tells you how many electrons thare are in an atom
6 .
A pure substance in which all of the atoms are identical is a description of .......
a compound
a mixture
an alloy
an element
Atoms of the same element have the same number of protons in the nucleus as each other
7 .
The name of a gas used in weather balloons is .......
chlorine
hydrogen
neon
nitrogen
Both hydrogen and helium are less dense than air. Helium is used in airships as it is unreactive and so safer than hydrogen (check out the Hindenburg disaster). Hydrogen, however, is still used in weather balloons as it is cheaper than helium
8 .
Li, Na, K and Cs are group 1 elements. The most reactive is .......
Cs
K
Li
Na
The elements in group 1 increase in reactivity as you go down the group. You may have seen a video of this - caesium explodes and destroys the bowl of water
9 .
The name of the element with the symbol Na is .......
napthalene
neon
nickel
sodium
This is a common symbol that you will come across dozens of times as you study science
10 .
The elements in group 7 of the periodic table are .......
conductors
gases
metals
non-metals
Group 7 is also referred to in some periodic tables as group 17 and the chemicals of this group are called the halogens
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