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galina1969 [7]
4 years ago
8

Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.

Chemistry
1 answer:
zimovet [89]4 years ago
5 0

Answer:

Number of neutrons: 44

Number of protons: 34

Number of electrons: 36

Explanation:

The atomic number of Se (Selenium) is 34

Mass number is 78

Number of neutrons = mass number - atomic number = 78 - 34 = 44

Number of protons is the same as the atomic number

Number of protons = 34

Selenium ion has a charge of -2. This means it accepts two more electrons

Number of electrons = atomic number + 2 = 34 + 2 = 36

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