Help me please 1) information about the atomic structure (structure of the atom)

2) information about the periodic table of the elements and the classification of the elements​

Im sorry cant help you their

Explanation: i dont know how to answer that question with the wording/format you chose

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.