What does each period in the periodic table correspond to?

• A new element discovery

• A new chemical property

• An electron shell being filled

• A new atomic theory

How many elements are in the first period of the periodic table?

• 1

• 2

• 3

• 4

What happens to the periods as you move down the periodic table?

• They become shorter

• They become wider

• They remain the same

• They disappear

What is the role of the periodic table in chemistry?

• To predict chemical reactions

• To organize chemical equations

• To arrange elements by color

• To explain and predict properties of elements

Which subshells are filled in the second electron shell?

• 1s and 2s

• 2s and 2p

• 3s and 3p

• 4s and 4p

What is the atomic number used for in the periodic table?

• To determine the element's color

• To arrange elements sequentially

• To measure the element's mass

• To predict the element's reactivity

What is the relationship between periods and electron shells?

• Each period corresponds to a new electron shell being filled

• Each period corresponds to a new element being discovered

• Each period corresponds to a new chemical property

• Each period corresponds to a new atomic theory

What is the main focus of the periodic table?

• To list all known compounds

• To organize chemical reactions

• To arrange elements and predict their properties

• To display atomic masses

What is the significance of the first electron shell (n = 1)?

• It is the largest shell

• It is the first to be filled

• It contains the most electrons

• It is the last to be filled

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

• It determines the element's color.

• It indicates the number of neutrons.

• It is the number of protons in an atom.

• It shows the element's reactivity.