Question

chemical formula ch4
electrons needed 8/2 for each atom
electrons available add up group #s
electrons shared needed minus available

of bonds shared divided by 2

electron dot diagram

Explanation:

Step1: Calculate electrons needed

Carbon (C) needs 8 electrons and each hydrogen (H) needs 2 electrons. In $CH_4$, there is 1 C and 4 H. So electrons needed = 8+(4×2)=16.

Step2: Calculate electrons available

Carbon is in group 4 and hydrogen is in group 1. So electrons available = 4+(4×1)=8.

Step3: Calculate electrons shared

Electrons shared = electrons needed - electrons available = 16 - 8=8.

Step4: Calculate number of bonds

Number of bonds = electrons shared / 2 = 8/2 = 4.

Step5: Draw electron - dot diagram

The central carbon atom is surrounded by 4 hydrogen atoms. Each C - H bond is represented by a pair of dots (electrons). The carbon atom has 8 electrons around it (4 pairs) and each hydrogen has 2 electrons (1 pair).

Answer:

Electrons Needed: 16
Electrons Available: 8
Electrons Shared: 8

of Bonds: 4

Electron Dot Diagram: Carbon in the center with 4 pairs of dots (electrons) connecting it to 4 hydrogen atoms.