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WorksheetsChemistry Y8 C8
Total questions: 16
Worksheet time: 30mins
Isotopes are atoms with the same number of (a) but different number of neutrons
Which of the following is NOT a characteristic of alkali metals
They are reactive metals.
They have low boiling points.
They react with water to form an alkaline solution.
They conduct electricity.
Tick the element/s that belongs to period 4
carbon
calcium
neon
magnesium
silicon
Write the electron structure of potassium
Which of the substances above are isotopes. (Give two substances)
(a)
I do not stay in one position since I am mobile. I am negatively charge and has no mass. Where am I found?
electron
proton
neutron
orbit
nucleus
State the symbol of the element that is found in group 3 period 2.
These are the subatomic particles found in the nucleus of an atom.
nucleus and protons
electrons and protons
protons and neutrons
neutrons and electrons
neutrons and nucleus
Which of the following is NOT correct?
Hydrogen has no group.
Hydrogen has proton, electron and neutron.
Hydrogen is a nonmetal.
Hydrogen belongs to period 1.
What is the valence electron of magnesium?
Identify the following: (5 marks)
a. nucleon number
b. proton number
c. electron structure
d. name of the element
e. number of neutrons
Carbon has an atomic number of 6. Explain why this element is neutral
Deduce the two products when strontium metal, a group II element, reacts with water. [2 marks]
Describe the colour change of the elements in group 7 down the group.
Who discovered the nucleus?
Thomson
Chadwick
Goldstein
Rutherford
Using the periodic table above,
1. In period 4, which has the highest melting point?
2. Which element has an electron structure of 2,8,4?
3. Which element is poisonous?
4. Which element has no group?
5. Which is the most reactive metal?
