Question

name symbol atomic number number of protons number of valence electrons hydrogen h 1 1 1 lithium li 3 1 nitrogen n 7 aluminum al 13 13 3 sulfur s 16

Explanation:

Step1: Recall atomic - number rule

The atomic number of an element is equal to the number of protons.

Step2: Fill in lithium's protons

For lithium with atomic number 3, the number of protons is 3.

Step3: Fill in nitrogen's atomic number

Nitrogen has 7 protons, so its atomic number is 7.

Step4: Determine nitrogen's valence electrons

Nitrogen's electron - configuration is 1s²2s²2p³. The number of valence electrons is 5.

Step5: Fill in sulfur's protons

Sulfur has an atomic number of 16, so the number of protons is 16.

Step6: Determine sulfur's valence electrons

Sulfur's electron - configuration is 1s²2s²2p⁶3s²3p⁴. The number of valence electrons is 6.

Answer:

Name	Symbol	Atomic Number	Number of Protons	Number of Valence Electrons
lithium	Li	3	3	1
nitrogen	N	7	7	5
aluminum	Al	13	13	3
sulfur	S	16	16	6