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 11
A neutral atom has 13 electrons. What is its atomic number?
An atom has 15 protons, 16 neutrons, and 15 electrons. What is its mass number?
An atom has a mass number of 40 and contains 18 protons. How many neutrons does it have?
An atom of chlorine has 17 protons and 18 neutrons. What is its atomic number and mass number?
An atom of element X has 20 protons and 22 neutrons. Write its atomic number and mass number.
An atom of sodium has 11 protons and 12 neutrons. What is its mass number?
Describe the relationship between atomic number, mass number, and the number of neutrons in an atom.
Explain why isotopes of the same element have different mass numbers but the same atomic number.
Which of the following elements has an atomic number of 6? (1) Nitrogen (2) Carbon (3) Oxygen (4) Fluorine
Which of the following elements has the highest atomic number? (1) Oxygen (2) Neon (3) Sodium (4) Magnesium
Which of the following is NOT true about atomic number? (1) It is unique for each element. (2) It can be a fraction. (3) It determines the element's position in the periodic table. (4) It is equal to the number of protons.
Which of the following pairs are isotopes? (1) ¹²C and ¹⁴C (2) ¹²C and ¹²N (3) ¹⁴N and ¹⁴O (4) ¹⁶O and ¹⁶F
Fill in the blank: The atomic number is denoted by the symbol ______.
Fill in the blank: The atomic number of oxygen is ______.
Fill in the blank: The element with atomic number 1 is ______.
Fill in the blank: The mass number of an atom is represented by the symbol ______.
True or False: Isotopes of an element have the same atomic number but different mass numbers.
True or False: The atomic number of an element can change during a chemical reaction.
True or False: The atomic number of an element determines its chemical properties.
True or False: The mass number of an atom is always greater than its atomic number.
