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 10
An atom has 11 protons and 12 neutrons. What is its mass number?
An atom has 26 protons, 30 neutrons, and 26 electrons. What is its atomic number and mass number?
An atom has 7 protons, 8 neutrons, and 7 electrons. What is its atomic number and mass number?
An atom of chlorine has 17 protons and 18 neutrons. What is its mass number?
An atom of magnesium has an atomic number of 12 and a mass number of 24. How many neutrons does it have?
Describe the difference between atomic number and mass number.
Explain why isotopes of the same element have different mass numbers but the same atomic number.
If an atom has 19 protons, 20 neutrons, and 19 electrons, what is its mass number?
If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have?
If the atomic number of an element is 20, what is the number of electrons in a neutral atom of this element?
The atomic number of carbon is 6. How many protons does a carbon atom have?
The symbol for sodium is Na. If sodium has an atomic number of 11 and a mass number of 23, how many neutrons does it have?
What does the atomic number of an element represent?
What is the mass number of an atom with 15 protons, 16 neutrons, and 15 electrons?
