Atomic Number and Mass Number
Chemistry ⇒ Atomic Structure and the Periodic Table
Atomic Number and Mass Number starts at 7 and continues till grade 12.
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See sample questions for grade 9
A neutral atom has 12 electrons. What is its atomic number?
An atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic number?
An atom has 19 protons and 20 neutrons. What is its mass number?
An atom of chlorine has 17 protons and 18 neutrons. What is its mass number?
An atom of sodium has an atomic number of 11. How many electrons does a neutral sodium atom have?
Context: An atom has 2 protons, 2 neutrons, and 2 electrons. What is the name of this element?
Context: An atom has 6 protons, 6 neutrons, and 6 electrons. What is its mass number?
Context: An atom of element X has 13 protons, 14 neutrons, and 13 electrons. What is the atomic number and mass number of element X?
Context: Two atoms have the same atomic number but different mass numbers. What are these atoms called?
Describe the difference between atomic number and mass number.
Explain why isotopes of the same element have different mass numbers.
Explain why the atomic number is important in the periodic table.
If an atom has 11 protons and 12 neutrons, what is its mass number?
If an atom has 15 protons, 16 neutrons, and 15 electrons, what is its mass number?
If an atom has a mass number of 40 and an atomic number of 20, how many neutrons does it have?
If an atom has an atomic number of 7 and a mass number of 15, how many neutrons does it have?
The atomic number of carbon is 6. How many protons does a carbon atom have?
The atomic number of oxygen is 8. How many neutrons are there in an oxygen atom with mass number 16?
The atomic number of potassium is 19. How many protons are present in a potassium atom?
What is the atomic number of an element?
