Atomic Structure and Isotopes

The video tutorial covers atomic numbers, mass numbers, and isotope symbols. It provides examples using chlorine, chromium, carbon, and potassium to illustrate how to calculate atomic and mass numbers, as well as determine the number of protons, electrons, and neutrons in an atom. The tutorial emphasizes the use of the periodic table and simple mathematical formulas to understand these concepts.

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The mass of the atom

• The total number of electrons

For the chlorine isotope with 18 neutrons, what is the mass number?

• 17

• 18

• 35

• 52

How is the symbol for a chlorine isotope with 18 neutrons represented?

• Cl with 17 at the top left and 35 at the bottom left

• Cl with 35 at the top left and 17 at the bottom left

• Cl with 18 at the top left and 17 at the bottom left

• Cl with 17 at the top left and 18 at the bottom left

In a neutral chromium atom, how many electrons are present?

• 26

• 52

• 28

• 24

What is the number of neutrons in a chromium atom with a mass number of 52?

• 28

• 30

• 24

• 52

For a carbon isotope with 7 neutrons, what is the atomic number?

• 6

• 14

• 7

• 13

What is the mass number of a carbon isotope with 7 neutrons?

• 13

• 14

• 7

• 6

How many protons are present in a potassium atom?

• 20

• 39

• 19

• 18

In a neutral potassium atom, how many electrons are there?

• 18

• 39

• 20

• 19

What is the number of neutrons in a potassium atom with a mass number of 39?

• 19

• 20

• 39

• 18