CHEM HELP: A monoatomic ion has a charge of 1+. This ion has 18 electron and 20 neutron?

2016-10-24 6:47 am

How many protons does the ion have?

What is the atomic number of the ion?

What element is it;what is its symbol?

What is the ion's mass number?

回答 (1)

胡雪8°

2016-10-24 6:54 am

✔ 最佳答案

The atom releases one electron to form the monatomic ion carrying 1+.
Number of electrons in the ion = 18
Hence, number of electrons in the atom = 18 + 1 = 19
Number of protons in the atom = Number of electrons in the atom = 19
Number of protons in the ion = Number of protons in the atom = 19

Since number of protons in the ion = 19
then the atomic number of the ion = 19

Potassium is the element with atomic number 19.
Hence, the element is potassium.
Its symbol is K.

Number of protons in the ion = 19
Number of neutrons in the ion = 20
Mass number of the ion = 19 + 20 = 39

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