Which is the correct lewis structure for carbon tetrabromide (cbr4), in which a central carbon atom is bound to four atoms of the group 7a element bromine?

a.)
b.)
c.)
d.)

Answer : The correct option is, (B)

Explanation :

Lewis-dot structure : It is defined as the it shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

The given molecule is, carbon tetrabromide

As we know that the carbon has '4' valence electrons, bromine has '7' valence electron.

Therefore, the total number of valence electrons in = 4 + 4(7) = 32

According to Lewis-dot structure, there are 8 number of bonding electrons present between the carbon-bromine and 24 number of non-bonding electrons present on the bromine.

Hence, the correct option is, (B)

linda: 3 ; laura: 15

step-by-step explanation:

note that linda + laura's age is 18, and that linda is 12 years younger than her sister.

let "linda" = x , "laura" = y:

x + y = 18

x = y - 12

first, plug in y - 12 for x in the first equation:

(y - 12) + y = 18

simplify.

2y - 12 = 18

isolate the variable (y). note the equal sign, what you do to one side, you do to the other. do the opposite of pemdas. first add, then divide.

2y - 12 (+12) = 18 (+12)

2y = 18 + 12

2y = 30

(2y)/2 = (30)/2

y = 30/2

y = 15

next, plug in 15 for y in the second equation (the other equation would work too).

x = y - 12

x = (15) - 12

x = 3

linda's age is 3, laura's age is 15.

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