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2 years ago

What does an atomic number represent in an atom?

Chemistry

2 answers:

egoroff_w [7]2 years ago

6 0

Answer: An atomic number represent protons in an atom.

Explanation:

An atom consists of electrons, protons, and neutrons. The protons and neutrons are present inside the nucleus of an atom whereas the electrons revolve around the nucleus of an atom.

The number of protons in an atom represents the atomic number of that particular atom. Further, this atomic number determines the place of each atom in the periodic table and its chemical properties.

For example, the mass number of sodium atom is 23 that is number of protons and neutrons. The atomic number of sodium is 11 that means there are 11 protons. The number of neutrons will be 23 - 11 = 12.

seraphim [82]2 years ago

5 0

It represents the number of protons in the nucleus of an atom which determines the chemical properties of an element.

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Feliz [49]

Answer:

12 more oxygen

Explanation:

An atom is the smallest particles that can take part in a chemical reaction

The given compounds are:

3Mg₃(PO₄)₂

Number of oxygen atoms = 3[2 x 4] = 24 oxygen atoms

For;

4Al₂O₃;

Number of oxygen atoms = 4 x 3 = 12 oxygen atoms

In 3Mg₃(PO₄)₂ , there are 24 - 12 = 12 more oxygen atoms than in 4Al₂O₃;

6 0

2 years ago

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A chemist prepares a solution of calcium bromide CaBr2 by measuring out 4.81μmol of calcium bromide into a 50.mL volumetric flas

Mariana [72]

Answer:

The concentration of the CaBr2 solution is 96 µmol/L

Explanation:

Step 1: Data given

Moles of Calciumbromide (CaBr2) = 4.81 µmol

Volume of the flask = 50.0 mL = 0.05 L

Step 2: Calculate the concentration of Calciumbromide

Concentration CaBr2 = moles CaBr2 / volume

Concentration CaBr2 = 4.81 µmol / 0.05 L

Concentration CaBr2 = 96.2 µmol /L = 96.2 µM

The concentration of the CaBr2 solution is 96 µmol/L

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Explanation:

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