Question

complete the statements describing periods 1 and 2 on the periodic table. is located in period 1. this period contains a total of elements. the valence electrons for these elements are located in the energy level. is located in period 2. this period contains a total of elements. the valence electrons for these elements are located in the energy level. show periodic table

Explanation:

Hydrogen (H) and helium (He) are in period 1. Period 1 has 2 elements and their valence - electrons are in the first energy level (n = 1). Elements in period 2 range from lithium (Li) to neon (Ne), there are 8 elements and their valence - electrons are in the second energy level (n = 2).

Answer:

• is located in period 1: Hydrogen (or H)
• This period contains a total of: 2
• The valence electrons for these elements are located in the: first
• is located in period 2: Lithium (or Li)
• This period contains a total of: 8
• The valence electrons for these elements are located in the: second