"An atom or ion has 43 neutrons , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion."

1. Mass number = 79

2. No charge

Explanation:

From the question given, we obtained the following data:

Neutron = 43

Proton = 36

Electron = 36

Mass number = proton + Neutron

Mass number = 43 + 36

Mass number = 79

Atomic number = proton number = 36

Therefore the element is Krypton (Kr).

The element has no charge since the proton number and electron are the same. its outer shell is completely filled being a member of the noble gas family(i.e group 0). From the calculations made above this element is simply an isotope of krypton because krypton has a mass number of 84 normally. Since the mass number(79) obtained above is different from this(84), it therefore means they have a different neutron number which is the basis for isotopy.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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