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Use the Periodic Table to complete the questions:

How many valence electrons do an atom of silicon (Si) and an atom of Hydrogen (H) have?

Periodic table

(1 point)
Responses

1:4
1:4

4:1
4:1

2:7
2:7

6:1
6:1
Question 2
Silane is a molecule made up of Silicon (Si) and Hydrogen (H).

Use the periodic table, and your knowledge of valence electrons, to determine the chemical formula for this substance.

(1 point)
Responses

SiH
SiH

Si2H4Si2H4

H2SO4H2SO4

SiH4SiH4
Question 3
What type of bonds are formed between silicon (Si) and hydrogen (H)?(1 point)
Responses

Polar
Polar

nuclear
nuclear

Ionic
Ionic

Covalent
Covalent
Question 4
Table of electronegativities of the elements.

Looking at the electronegativities of silicon and hydrogen, what can you determine about their electronegativities?

(1 point)
Responses

The values of their electronegativities are similar.
The values of their electronegativities are similar.

The values of their electronegativities are extremely far apart.
The values of their electronegativities are extremely far apart.

Silicon has half the electronegativity of hydrogen.
Silicon has half the electronegativity of hydrogen.

Silicon has twice the electronegativity of hydrogen.
Silicon has twice the electronegativity of hydrogen.

1 answer

Let's go through each question one by one:

Question 1: How many valence electrons do an atom of silicon (Si) and an atom of hydrogen (H) have?

  • Silicon (Si) has 4 valence electrons (it is in group 14).
  • Hydrogen (H) has 1 valence electron (it is in group 1).

Correct response: 4:1

Question 2: Silane is a molecule made up of Silicon (Si) and Hydrogen (H). What is the chemical formula for this substance?

  • Silane consists of one silicon atom and four hydrogen atoms.

Correct response: SiH4

Question 3: What type of bonds are formed between silicon (Si) and hydrogen (H)?

  • Silicon and hydrogen form covalent bonds as they share electrons.

Correct response: Covalent

Question 4: Looking at the electronegativities of silicon and hydrogen, what can you determine about their electronegativities?

  • Silicon has an electronegativity of about 1.90 (Pauling scale), while hydrogen has an electronegativity of about 2.20. The difference is small, suggesting that the values are relatively close.

Correct response: The values of their electronegativities are similar.

To summarize:

  1. 4:1
  2. SiH4
  3. Covalent
  4. The values of their electronegativities are similar.