Question

How many protons and neutrons are in an atom with this representation:

27 ?
17

Which element would have this representation:

43 ?
21

If a neutral atom gains 4 electrons, its charge will be…

Answer 1

Step-by-step explanation:

There isn't any set number of isotopes an atom can have. As the number of neutrons in an atom increases or decreases, the isotopes tend to become more and more unstable until they get to the point where they decay faster than neutrons can change. According to the International Atomic Energy Agency, Mercury currently has the most at 45 identified isotopes.

Answer 2

1. 17 protons / 10 neutrons

2. Scandium

3. Negative

Step-by-step explanation:

1. The bottom number is the same as the atomic number on top of the abbreviation. To find the # of neutrons, subtract the mass number with the number of protons

2. The bottom number (21) is the number of protons AND the atomic number (the a.n & # of pro. are always going to be the same)

3. Always think about this: if you add electrons, you take away charge - if you take away electrons, you add charge

*Idek if these were the correct correct answers but I tried my best*