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 12
An atom has 13 protons, 14 neutrons, and 13 electrons. What is its mass number?
An atom of calcium has 20 protons and 20 neutrons. What is its symbol in the form AZX?
An atom of chlorine has 17 protons and 18 neutrons. What is its mass number?
An atom of element X has 20 protons, 20 neutrons, and 20 electrons. What is its mass number?
An atom of iron has 26 protons and 30 neutrons. What is its mass number?
An atom of potassium has an atomic number of 19 and a mass number of 39. How many neutrons does it have?
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is its mass number?
An atom of element X has 20 protons, 20 neutrons, and 20 electrons. What is its mass number?
Which of the following atoms has the greatest number of neutrons? (1) 126C (2) 146C (3) 168O (4) 2311Na
Which of the following best describes the relationship between atomic number and the periodic table? (1) Elements are arranged in order of increasing atomic number. (2) Elements are arranged in order of increasing mass number. (3) Elements are arranged alphabetically. (4) Elements are arranged by number of neutrons.
Which of the following elements has 12 protons? (1) Sodium (2) Magnesium (3) Aluminum (4) Silicon
Which of the following elements has the atomic number 1? (1) Helium (2) Hydrogen (3) Lithium (4) Beryllium
Fill in the blank: The number of neutrons in an atom is equal to ________ minus the atomic number.
Fill in the blank: The sum of the number of protons and neutrons in an atom is called the ________.
The atomic number of an element is also known as its ________ number.
The mass number of an atom is represented by the symbol ________.
Isotopes of an element have the same atomic number but different mass numbers. True or False?
The atomic number of an element is always a whole number. True or False?
True or False: The atomic number determines the chemical properties of an element.
True or False: The atomic number of an element can be used to identify the element.
