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nignag [31]
3 years ago
15

What is the composition of an isotope of calcium (atomic number 20)?

Chemistry
2 answers:
anzhelika [568]3 years ago
6 0

Answer:

The answer to your question is: last option.

20 protons

20 electrons

25 neutrons

Explanation:

Data

Calcium, atomic number 20

Atomic number indicates the number of protons in an element, so, if Calcium's atomic number is 20, it means that it has 20 protons.

In a neutral element, the number of protons = number of electrons, then

Calcium has 20 electrons.

Only the number of neutrons could change.

According to the previous description, the last option is correct.

beks73 [17]3 years ago
4 0

Answer:

i think c

Explanation:

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3 years ago
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Determina el numero de masa para el paladio en la siguiente tabla:*
Damm [24]

The concept of atomic masses we can find that the correct answer is:

       c) 101

The atomic mass or mass number of an element is the sum of its protons plus the neutrons that are in the atomic nucleus, the electrons are not taken into account because they have a mass much lower than the masses of protons and neutrons.

   

In the table they indicate that there are 46 protons and 55 neutrons, therefore

          M = #_ {protons} + #_ {neutrons}

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In conclusion using the concept of atomic masses we find that the correct answer is:

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5 0
2 years ago
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5 0
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3 years ago
How much heat does it take to melt 5.0g solid copper?
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Answer:

Q=1.04kJ

Explanation:

Hello,

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Nevertheless, since the given enthalpy is per mole of copper, we need to use its atomic mass to perform the correct calculation as follows:

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