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3 years ago

PLEASE HELP! mass number - atomic number =

Chemistry

2 answers:

Dmitry [639]3 years ago

7 0

Answer:

Number of neutrons

Explanation:

The mass number represents the number of protons and neutrons combined and the atomic number only represents the number of protons.

mass number - atomic number = number of neutrons

Arisa [49]3 years ago

6 0

Answer:

mass number - atomic number = number of neutrons

Explanation:

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. The mass number minus the atomic number represent the number of neutrons.

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In an ionic compound, there will be strong force of attraction between the combining atoms due to the opposite charges present on them.

For example, $CaBr_{2}$ is an ionic compound where calcium has a +2 charge and each bromine atom has a -1 charge.

Therefore, in order to break the bond we need to provide more heat. Hence, boiling point of calcium bromide will be the highest.

$NBr_{3}$ is a covalent compound and as nitrogen is more electronegative in nature and also has a lone pair of electron hence, there will be a net dipole moment.

$CBr_{4}$ is also a covalent compound. And, as bromine is more electronegative than carbon atom so, dipole moment is in the outwards direction. Hence, in $CBr_{4}$ there will be zero dipole moment.

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$Br_{2}$ is a covalent compound and there will be no dipole moment.

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$Br_{2}$ < $CBr_{4}$ < $NBr_{3}$ < $CaBr_{2}$

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