This says four figures. The 4 figures you should use are 4546 with a peek at 7 to see what effect it will have on the 4 main figures.
45.467 rounds to 45.47
You round the 4th figure up one. You are not concerned about the decimal places in this question.
Answer: 4 valence electrons, Silicon, Si, 14, 28.0855, 14
Explanation:
A covalent bond? Not sure how much detail you want, sorry
