Question

question 9 1 pts isotopes are atoms that have the same ____ but differing __. atomic masses, charges charges, atomic masses atomic numbers, mass numbers mass numbers, atomic numbers mass numbers, charges question 10 1 pts elements ____ exhibit similar physical and chemical properties. with similar chemical symbols in the same period of the periodic table on opposite sides of the periodic table with similar atomic masses in the same group of the periodic table

Explanation:

For Question 9, isotopes are defined as atoms of the same element (same atomic number) with different numbers of neutrons, resulting in different mass numbers. For Question 10, elements in the same group of the periodic table have the same number of valence - electrons, which leads to similar physical and chemical properties.

Answer:

Question 9: C. atomic numbers, mass numbers
Question 10: E. in the same group of the periodic table