# Help with the following questions???

## 1) What is the net charge of an atom with no electrons? 2) What is the mass number of a nitrogen atom with $8$ neutrons? 3) What is the net charge of a nitrogen atom with only $6$ electrons? 4) What is the mass number of a chlorine atom with $18$ neutrons? 5) What is the atomic number of a nitrogen-15 isotope? 6) What is the element with atomic number $17$? 7) What is the name of element $X$? 8) What is the net charge of a nitrogen atom with $8$ electrons?

2. The mass number is the total number of protons plus neutrons. Therefore, the mass number must be $7 + 8 = \boldsymbol{15}$.
3. The net charge only incorporates charged particles, so with $7$ protons (positive) and $6$ electrons (negative), the net charge is simply $7 \times \left(+\right) + 6 \times \left(-\right) = \boldsymbol{+ 1}$.
4. Same idea as $2$. Therefore, the mass number is $17 + 18 = 35$. We write that as ""^35 X, where $X$ is the chemical symbol.
5. See $2$.
6. The element is identified by its atomic number, which is its number of protons. Therefore, with $17$ protons we have $\boldsymbol{\text{Cl}}$, or chlorine. Look at any periodic table to convince yourself that the $17$th element is $\text{Cl}$.
7. This question doesn't make sense. The element always has a name, if it's a previously-discovered element. Otherwise it's called the latin for "unknown element number $X$"...
8. $\boldsymbol{- 1}$. See $3$.