Build an atom using 4 protons, 5 neutrons, and 4 electrons. What element is it?

Answer 1

Well, you got #"beryllium............"#, #""^9Be#.

There are 4 nuclear protons, i.e. #Z=4#, which specifies the element beryllium. How do you know? You look at the Periodic Table, and since you are doing your chemistry homework there will be one beside you now. The atomic mass is expressed by the number of massive particles, protons, and neutrons, and since we have 5 neutrons, the isotope is #""^9Be#.

Finally we can assign the charge. There are 4 protonic charges, and 4 electronic charges: the isotope is neutral.

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Answer 2

Noah Aldrich

The element Beryllium (Be) is represented by an atom with four protons, five neutrons, and four electrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.