Question

group 18 is known as the ____? 5 points
kings and queens of the periodic table
the chalcogen group
the noble gases
the alkali earth metals
what scientist organized our current, modern periodic table? 5 points
h.g.j. moseley
d. mendeleev
a. lavoisier
j. dalton
isotopes of elements vary in the number of ____? 5 points
protons and electrons
atomic radius
behavior
neutrons

Explanation:

• Group 18 elements in the periodic table are known as noble gases due to their low reactivity.
• H.G.J. Moseley's work on atomic numbers helped organize the modern - day periodic table.
• Isotopes of an element have the same number of protons but differ in the number of neutrons.

Answer:

1. C. The Noble Gases
2. A. H.G.J. Moseley
3. D. neutrons