Question

28Si
what is the atomic mass, mass#, protons, neutrons, electrons

Answer 1

So, to do this you will first have to look at the element you're working with.

The '28' in front of the Si signifies its mass number. You will have to look on the periodic table for Si (silicon) for its atomic number, which is 14.

So the atomic mass = mass number or molar mass and is in front of the element in your question. That is 28.

I'm not sure what you mean by 'mass', however if you ever need to work out the mass of an element in a question, you can use: mass = moles x molar mass

To find out how many protons are in an element, you just have to look at the periodic table at its atomic number. Silicon's atomic number is 14, meaning it has 14 protons (the number of protons of an element never changes).

To find out how many neutrons it has, you will have to look at its mass number (atomic mass). The atomic mass of an element is made from protons and neutrons. So to find neutrons you will have to do: mass number - proton number = number of neutrons
Which is: 28 - 14 = 14, meaning there are 14 neutrons.

To find electrons, you just have to make sure there is no charge on the element. (a charge would be for example, 28Si-1 etc.). But because your element has no charge it means it is neutral, and that means its protons and electrons are balanced out. This means the number of electrons it has, is the same as the number of protons it has, which is 14.

I hope this helps :)

Answer 2

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