A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons. element symbol: mass number: number of protons:

1. The symbol of the element is Kr

2. The mass number of the element is 81

3. The proton number of the element is 36

The answer to the question given above, is shown below:

Since the isotope is neutral, it means the atomic number (i.e the proton) and the number of electron are equal.

The isotope has 36 electrons. Therefore, the atomic number is also 36.

Element having atomic number of 36 from the periodic table is Krypton with the symbol of Kr.

Neutron = 45

Atomic number = 36

Mass number = atomic number + Neutron

Mass number = 36 + 45

The atomic number of an element is simply the proton. Thus,

Atomic number = 36

1. The symbol of the element is Kr

2. The mass number of the element is 81

3. The proton number of the element is 36

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Kr, mass number 81, number protons 36.

Explanation:

If the atom has 36 electrons, and it is neutral, it has 36 protons. 36 protons means that this element has atomic number = 36. This is Kr.

Mass number = number protons + number neutrons = 36 + 45 = 81

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