Question

question 1 (1 point) given the chemical symbol below, what does the bottom number represent? 13 ai aluminium 26.982 a neutrons b protons c electrons d mass number

Explanation:

In the periodic - table symbol for an element, the bottom number is the atomic mass. The number 26.982 for aluminium is its average atomic mass. However, if we consider the number 13 (the top number in the symbol), it represents the atomic number which is the number of protons. Since the question asks about the bottom number in the context of the given options and considering the most common meaning of numbers in element symbols, the bottom number here represents the average atomic mass. But since there is no such option and assuming the question might be mis - phrased and refers to the top number 13, the number of protons is 13 for aluminium.

Answer:

b. Protons