Exploring the Periodic Table

What are the horizontal rows in the periodic table called?

• Families

• Groups

• Periods

• Blocks

How many groups are there in the modern periodic table?

• 18

• 12

• 16

• 20

What is the electron configuration of oxygen?

• 1s² 2s² 2p²

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁵

• 1s² 2s² 2p³

Define isotopes and give an example.

• Isotopes are variants of an element with the same number of protons but different numbers of neutrons. Example: Carbon-12 and Carbon-14.

• Isotopes are elements with the same number of neutrons but different protons.

• Isotopes are identical elements that differ in their chemical properties.

• Example of isotopes includes Hydrogen-1 and Oxygen-16.

What is the atomic number of carbon?

• 12

• 6

• 5

• 7

How is atomic mass different from atomic number?

• Atomic mass is the average mass of an atom's isotopes; atomic number is the number of protons in the nucleus.

• Atomic mass is the total number of electrons in an atom.

• Atomic number is the average mass of an atom's isotopes.

• Atomic mass is the number of neutrons in the nucleus.

Which group in the periodic table contains noble gases?

• Group 7

• Group 1

• Group 14

• Group 18

What determines the electron configuration of an element?

• The temperature of the element

• The color of the element

• The mass of the element

• The number of electrons and their arrangement in atomic orbitals.

How many electrons can the first shell of an atom hold?

• 10

• 8

• 1

• 2

What is the significance of the atomic number in the periodic table?

• The atomic number indicates the mass of the element.

• The atomic number is used to determine the color of the element.

• The atomic number represents the number of neutrons in the nucleus.

• The atomic number is significant because it defines the element and its properties.