Question

1. identify the number of valence electrons.
2. put a check mark in the box to identify which elements will gain electrons and which will lose electrons.

acids and bases
bohr model # of valence elections will give away (lose) valence elections will add (gain) extra elections

Explanation:

Step1: Determine valence - electrons of H

Hydrogen (H) has atomic number 1. Its electron - configuration is 1s¹. So, it has 1 valence electron. It can lose this 1 electron to form H⁺ or gain 1 electron to have a full outer shell like helium.

Step2: Determine valence - electrons of O

Oxygen (O) has atomic number 8. Its electron - configuration is 1s²2s²2p⁴. The outer shell (n = 2) has 6 electrons, so it has 6 valence electrons. Oxygen is a non - metal and tends to gain 2 electrons to achieve a stable octet configuration.

Step3: General rule for metals and non - metals

Metals tend to lose electrons and non - metals tend to gain electrons.

Step4: Determine for other unspecified elements

Without knowing the specific elements, we follow the general rule based on their position in the periodic table. Non - metals (right side and top of the periodic table) gain electrons and metals (left side and bottom) lose electrons.

Bohr Model	# of valence electrons	Will give away (lose) valence electrons	Will add (gain) extra electrons
O	6	No	Yes (needs 2 more for octet)

Answer:

Bohr Model	# of valence electrons	Will give away (lose) valence electrons	Will add (gain) extra electrons
O	6		√