Can you explain the answer of this question below:An element has 18 electrons, and 20 .neutrons. Its charge is —2. What is its mass number?A:32B:38C:39D:40The answer is c.

Question

Can you explain the answer of this question below:An element has 18 electrons, and 20 .neutrons. Its charge is &mdash;2. What is its mass number?A:32B:38C:39&#8203;D:40The answer is c.

Answer

None of these

mass no.=no. of proton+no. of neutron

here no. of proton is 2 less than no. of electron as the charge on element is -2

hence no. of proton=18-2=16,

no. of neutron =20

hence mass number is 16+20=36

Answer

Formation of cation and anion doesn't depend on atomic. mass.  its charge is -2 that means it accepted two electrons but proton no. is as usual 16 anf no. og neutrons is 20 so mass no. will be 36

Answer

I think its 36

Answer

19 protons (as do all potassium atoms and ions) 20 neutrons ( from mass number [39] - atomic number [19] = number of neutrons [20]) 18 electrons (the normal 19 electrons of a potassium atom minus one because the species has a positive charge, that is, has lost one electron)

Answer

The and should be 36

Answer

Well according to concept, it should be 36 and if we go by reality 20 neutrons are present in potassium and has 19 protons. so according to concept answer is 36 and according to reality its pottasium's anomalous mass number.

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I also think 36

Answer

I think the answer is 40 because it has 18 electrons initially but after it gains two electrons now it has become 20 electrons therefore 20 Electrons + 20 neutrons give 40 which is the mass number of autumn

Answer

I think 40

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Its ans is 36 as I think

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1st it has 18 electron but it has -2 charge so it gain 2 electrons so no of protons = no of electron =20 mass number is no of protons + no of neutrons so answer is 40 plzzz clarify my doubt

Answer

36

Answer

Right ans is 40

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Without any doubt the answer is 36

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36 hi hoga I m confirm

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Answer is 36, dude...

Answer

Neutral.

The number of electrons in a neutral atom is equal to the number of protons in its nucleus. Since the element has 18 electrons, it also has 18 protons. The charge of a proton is +1, so the total positive charge from the protons is +18.

Neutrons do not have a charge, so the total charge from the neutrons is 0.

To find the overall charge of the atom, we need to consider the balance of positive and negative charges. In a neutral atom, the number of protons (positive charge) is equal to the number of electrons (negative charge). Since the element has 18 protons (positive charge) and 18 electrons (negative charge), the overall charge is neutral (0).

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