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Inessa05 [86]
3 years ago
10

If an isotope of an element has 40 neutrons and a mass number of 79, how many electrons must it have?

Chemistry
1 answer:
34kurt3 years ago
5 0

Answer: 39 electrons

Explanation: Subtract 79 by 40 to get the atomic number (amount of protons) which is 39. The number of electrons must be the same as the number of protons if it's not an ionic compound so the amount of electrons is the same amount of protons.

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The number of protons in every atom of an element
ANTONII [103]

Answer: The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.

Explanation:

4 0
3 years ago
giving the incomplete equation 2N2O5 (g) which set of products completes and balances the incomplete equarion
a_sh-v [17]

Answer:

The complete question is as follows

Given the incomplete equation: 2 N2O5(g) ==>  Which set of products completes and balances the incomplete equation?

A)2 N2(g) + 3 H2(g)

B)2 N2(g) + 2 O2(g)

C)4 NO2(g) + O2(g)

D)4 NO(g) + SO2(g)

The correct option is C) 4NO2(g) + O2(g)

Explanation:

Note that the products should be NO2 and O2 since the reactant is entirely made up of N and O. option A is not correct as hydrogen cannot emerge as a product in this reaction. Matter can never be created or be destroyed bu can only change in a chemical reaction. Option D is not also correct for the same reason.

Option B is not correct since it did not balance the number of atoms of O and N in the reactant side of the equation.

The option C) 4NO2(g) + O2(g) is therefore the right option since it balances both the elements and the number of atoms of the elements present.

7 0
3 years ago
How to do 22.4 kg/L to kg/mL
emmainna [20.7K]
1 kg/L ----------- 0.001 kg/mL
22.4 kg/L ------- ??

22.4 x 0.001 / 1 => 0.0224 kg/mL
6 0
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Why does ice float in water?
MaRussiya [10]
Ice has a lower density than the density of water.
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Protons .because electron has negative charge and proton has positive charge.
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