Which one of the following is NOT a similarity between carbon, C, and silicon, Si? -They are in the same group together.

-They have the same amount of core electrons.

-They have the same number of valence electrons.

-They have similar properties.

it is a solid

explanation:

the maximum mass of nh3 is nh3 in grams

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.