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?
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?
If the atomic number of an element is 15, what is the symbol for this element? (1) P (2) S (3) Cl (4) K
Which of the following best describes isotopes? (1) Atoms with the same number of protons but different numbers of neutrons. (2) Atoms with the same number of neutrons but different numbers of protons. (3) Atoms with the same mass number but different atomic numbers. (4) Atoms with different numbers of electrons only.
Which of the following elements has the highest atomic number? (1) Hydrogen (2) Oxygen (3) Neon (4) Calcium
Which of the following is correct for an atom with atomic number 8 and mass number 16? (1) 8 protons, 8 neutrons (2) 8 protons, 16 neutrons (3) 16 protons, 8 neutrons (4) 8 protons, 8 electrons, 8 neutrons
Fill in the blank: The atomic number is represented by the symbol _______.
Fill in the blank: The chemical properties of an element are determined by its _______.
Fill in the blank: The mass number is represented by the symbol _______.
Fill in the blank: The number of electrons in a neutral atom is equal to its _______.
Is it possible for two different elements to have the same atomic number? Yes or No?
Isotopes of an element have the same atomic number but different mass numbers. True or False?
The atomic number of an atom is always less than or equal to its mass number. True or False?
The atomic number of an element is always a whole number. True or False?
