The atomic number of an element is determined by the number of:
Question 4
What is the mass number of an atom?
Question 5
Who discovered the electron?
Question 6
What is the smallest particle of an element that retains its chemical properties?
Question 7
In a neutral atom, the number of electrons is equal to the number of:
Question 8
The sum of protons and neutrons in the nucleus of an atom is called:
Question 9
Which of the following is a diatomic molecule?
Question 10
What is the chemical symbol for sodium?
Question 11
How many atoms are present in one molecule of water (H2O)?
Question 12
What is the chemical formula for methane?
Question 13
The process of the combination of two or more atoms to form a molecule is called:
Question 14
What is the charge of a neutron?
Question 15
Which subatomic particle is responsible for the chemical properties of an element?
Question 16
What is the formula for the compound sulfur hexafluoride?
Question 17
Who proposed the planetary model of the atom?
Question 18
What is the chemical symbol for gold?
Question 19
How many electrons are there in the outermost shell of a chlorine atom?
Question 20
Which of the following is a cation?
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