Question

as you move from left to right across the second period of the periodic table 5 points ionization energy increases atomic radii increase electronegativity decreases atomic mass decreases which group of elements on the periodic table are known as the alkali metals? 5 points group 10 group 13 group 16 group 1 what is the element with the atomic number of 80? 5 points selenium neon mercury francium

Explanation:

1. As you move from left - right across a period, ionization energy increases due to increasing nuclear charge and decreasing atomic radius. Atomic radius decreases, electronegativity increases, and atomic mass generally increases.
2. Alkali metals are in Group 1 of the periodic table. They are highly reactive metals.
3. The element with atomic number 80 is Mercury. Selenium has atomic number 34, Neon has atomic number 10, and Francium has atomic number 87.

Answer:

1. Ionization energy increases
2. Group 1
3. Mercury