Question

an element has atomic number 20.its cation has 2 units positive charge. How many protons and electrons are present in the cation
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Answer 1

Answer:

Explanation:

atomic no = no of protons

the number of protons = 20

no of electrons = no of protons - charge

                          =  20 - 2

                          = 18

Answer 2

$\bold{CATION}$

Cation is positively charged ion which is formed when a metal loses its electron due to which the number of protons on the element has aquired a positive charge .

$\bold{GIVEN}$

ATOMIC NUMBER = 20

ELECTRONIC CONFIGURATION = 2 , 8 ,8 2

VAKENCY = +2

CATION = +2

From above information we can convey that this element lies in peroid 4 and in group 2.

The cation is +2 which means this ion have losed its two electrons to be stable like nearest noble gas.

We know

Atomic number = Number of protons = Number of electrons.

Before forming cation:-

So, Number of protons = 20

Number of electrons = 20

Since, the element have losed its two electrons it have

Number of electrons = 20 - 2 = 18

so, the cation have

◼18 ELECTRONS

◼20 PROTONS