All categories

4 years ago

How many protons does an atom of bromine have ?

Chemistry

2 answers:

Nostrana [21]4 years ago

5 0

Each atom of bromine has 35 protons and this is bromine's atomic number.

Darya [45]4 years ago

5 0

In $^A_ZX$ , $Z$ is the number of protons.
And we have : $_{35}Br$ , so $Z=35$ .

So there are 35 protons in the bromine.

You might be interested in

You are given a solid that is a mixture of Na2SO4 and K2SO4. A 0.205-g sample of the mixture is dissolved in water. An excess of

Svetach [21]

Answer:

Mass of SO₄⁻² = 0.123 g.

Mass percentage of SO₄⁻² = 41.2%

Mass of Na₂SO₄ = 0.0773 g

Mass of K₂SO₄ = 0.1277 g

Explanation:

Here we have

We place Na₂SO₄ = X and

K₂SO₄ = Y

Therefore

X +Y = 0.205 .........(1)

Therefore since the BaSO₄ is formed from BaCl₂, Na₂SO₄ and K₂SO₄ we have

Amount of BaSO₄ from Na₂SO₄ is therefore;

$X\times\frac{Molar \, Mass \, of \, BaSO_4}{Molar \, Mass \, of \, Na_2SO_4}$

Amount of BaSO₄ from K₂SO₄ is;

$Y\times\frac{Molar \, Mass \, of \, BaSO_4}{Molar \, Mass \, of \, K_2SO_4}$

Molar mass of

BaSO₄ = 233.38 g/mol

Na₂SO₄ = 142.04 g/mol

K₂SO₄ = 174.259 g/mol

$X\times\frac{Molar \, Mass \, of \, BaSO_4}{Molar \, Mass \, of \, Na_2SO_4}$ = $X\times\frac{233.38 }{142.04}$ = 1.643·X

$Y\times\frac{Molar \, Mass \, of \, BaSO_4}{Molar \, Mass \, of \, K_2SO_4}$ = $Y\times\frac{233.38 }{174.259 }$ = 1.339·Y

Therefore, we have

1.643·X + 1.339·Y = 0.298 g.....(2)

Solving equations (1) and (2) gives

The mass of SO₄⁻² in the sample is given by

Mass of sample = 0.298

Molar mass of BaSO₄ = 233.38 g/mol

Mass of Ba = 137.327 g/mol

∴ Mass of SO₄ = 233.38 g - 137.327 g = 96.05 g

Mass fraction of SO₄⁻² in BaSO₄ = 96.05 g/233.38 g = 0.412

Mass of SO₄⁻² in the sample is 0.412×0.298 = 0.123 g.

Percentage mass of SO₄⁻² = 41.2%

Solving equations (1) and (2) gives

X = 0.0773 g and Y = 0.1277 g.

8 0

3 years ago

Which nuclear emission is negatively charged?

Vlada [557]

I think is 4 but Iam not sure

6 0

4 years ago

Read 2 more answers

What element is this?

LiRa [457]

i think helium hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

8 0

3 years ago

Which is true according to the law of conservation of energy?

alexandr1967 [171]

Answer: E) In a closed system, the total energy always remains constant.

Explanation: For every system, the law of conservation of energy is applicable which states that the energy of the system remains conserved. Energy can neither be created nor destroyed.

A closed system is one which can exchange energy with the surroundings but not mass. Thus if a system absorbs energy, the equivalent amount of energy is lost by surroundings, thus the total energy remains constant.

If a system loses energy, an equivalent amount of energy is gained by surroundings, thus the total energy remains constant.

3 0

4 years ago

Read 2 more answers

In the periodic table below, shade all the elements for which the neutral atom has a valence electron configuration of ns2np3 ,

Lorico [155]

Answer is: chemical elements in group 15 of the periodic table have neutral atom with a valence electron configuration of ns²np³.
Nitrogen: [He] 2s² 2p³.
Phosphorus: [Ne] 3s² 3p³.
Arsenic: [Ar] 3d¹⁰ 4s² 4p³.
Bismuth: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³.
Moscovium: predicted [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³.
These elements have 5 valence electrons.

5 0

4 years ago