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Atoms, Elements and Ions
Atoms, Elements and Ions
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Year 8 Chemistry Quiz - Atoms, Elements and Compounds #AHSquiz #8 #chemistry
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Questions
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Answers
1
A lithium atom has 3 protons, 4 neutrons and 3 electrons. What is its mass number?
6
3
7
4
2
Which of the following is TRUE for protons:
negatively charged, found in the electron shells
positively charged, found in the nucleus
positively charged, found in the electron shells
no charge, found in the nucleus
3
Correctly identify the chemical symbol for Calcium
Ca
CA
C
ca
4
Hydrogen gas has chemical formula H2. It is a/an:
compound
atom
molecule
element
5
Aluminium has the atomic number 13. What is it's electronic configuration?
2 : 8 : 6
2 : 8 : 3
2 : 13
2 : 8 : 1
6
Which of the following is NOT TRUE for electrons:
they are found in the electron shells
they are negatively charged
they are positively charged
they have very little mass
7
A Magnesium atom has 12 protons, 12 neutrons and 12 electrons. What is its atomic number?
12
6
2
24
8
The chemical formula for hydrogen peroxide is H2O2. How many atoms of each is in one molecule:
2 hydrogen and 1 oxygen
2 hydrogen 2 orion
2 hydrogen 2 oxygen
1 hydrogen 1 oxygen
9
Which of the following is true for ions:
Cations are positively charged, anions are negatively charged.
Cations are negatively charged, anions are positively charged.
10
Which sub-atomic particle is the lightest?
Neutrons
Atoms
Electrons
Protons
11
Propane has chemical formula C3H8. It is a/an:
compound
atom
element
molecule
12
The atomic symbol pictured here is for Carbon. How many electrons does it have?
6
2
8
4
13
The chlorine atom gains 1 electron to form an ion. What is it's charge?
Cl -
Cl +
Cl -2
Cl +2
14
The electrons are found in the:
electron shells
nucleus
15
A nucleus is stable when the strong nuclear force is greater than the electrostatic force.
True
False
16
Which of the following is NOT TRUE for neutrons
They have no charge
They are found in the nucleus
Atomic number equals number of neutrons.
They have a mass of 1
17
The strong nuclear force is:
Repulsive
Attractice
