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.
An atom of magnesium has an atomic number of 12 and a mass number of 24. How many neutrons does it 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?
Which of the following elements has an atomic number of 1? (1) Helium (2) Hydrogen (3) Lithium (4) Oxygen
Which of the following is correct about the mass number? (1) It is always less than the atomic number. (2) It is always equal to the number of electrons. (3) It is the sum of protons and neutrons. (4) It is the number of protons only.
Which of the following is NOT true about atomic number? (1) It is unique for each element. (2) It is the number of protons. (3) It can be a decimal. (4) It determines the element's position in the periodic table.
Which of the following is the correct way to represent an atom of carbon with atomic number 6 and mass number 14? (1) ¹⁴₆C (2) ⁶₁₄C (3) ¹⁴C₆ (4) ⁶C₁₄
Fill in the blank: The atomic number determines the __________ of an element in the periodic table.
Fill in the blank: The atomic number is represented by the symbol _______.
Fill in the blank: The mass number is represented by the symbol _______.
Fill in the blank: The mass number of an atom is the sum of its protons and __________.
Isotopes of an element have the same atomic number but different mass numbers. True or False?
True or False: The atomic number of an element can never change in a chemical reaction.
True or False: The mass number of an atom is always a whole number.
True or False: The number of neutrons in an atom can be calculated by subtracting the atomic number from the mass number.
