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 8
An atom has 11 protons and 12 neutrons. What is its mass number?
An atom has 15 protons, 16 neutrons, and 15 electrons. What is its mass number?
An atom has 19 protons, 20 neutrons, and 19 electrons. What is its mass number?
An atom has 2 protons, 2 neutrons, and 2 electrons. What is the element?
An atom has 26 protons, 30 neutrons, and 26 electrons. What is its mass number?
An atom has 6 protons, 6 neutrons, and 6 electrons. What is its mass number?
An atom of chlorine has a mass number of 35 and an atomic number of 17. How many neutrons does it have?
An atom of magnesium has 12 protons and 12 neutrons. What is its mass number?
Which of the following best describes isotopes? (1) Atoms with the same number of protons but different numbers of neutrons. (2) Atoms with different numbers of protons and electrons. (3) Atoms with the same mass number but different atomic numbers. (4) Atoms with the same number of neutrons but different numbers of protons.
Which of the following is NOT needed to calculate the mass number of an atom? (1) Number of protons (2) Number of neutrons (3) Number of electrons (4) Both protons and neutrons
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 identity.
Which of the following is the correct definition of mass number? (1) Number of protons (2) Number of neutrons (3) Number of protons plus neutrons (4) Number of electrons plus protons
Fill in the blank: The atomic number is always equal to the number of _______ in a neutral atom.
Fill in the blank: The atomic number of hydrogen is _______.
Fill in the blank: The atomic number of nitrogen is _______.
Fill in the blank: The atomic number of oxygen is _______.
True or False: Isotopes of an element have the same atomic number but different mass numbers.
True or False: The atomic number is always written as a subscript to the left of the element symbol.
True or False: The atomic number of an atom is always less than its mass number.
True or False: The atomic number of an element can be used to identify the element.
