Major Chemistry problems..!!!!?

Question

The mass of Beryllium atom is 1.4965x10^ -23 g. Using this fact, and other information you can find, find the mass of a Be+2 ion.

i need major help!? The answer in the back of the book is 1.4963x10^-23 grams but i have no idea how to get it.

Answer 1

Be+2 has two less electrons than Be (just a regular Beryllium atom). Note: that's what the +2 denotes, if it had one less electron it would be +1 and if it had and extra electron it would be -1

so just subtract the mass of two electrons. the mass of an electron is 9.10938188 × 10^-28 grams. multiply that by two and subtract it from the mass of the beryllium atom

Answer 2

Did you go through your notes?