Question

question 1 (1 point) in the periodic table hydrogen is placed and group 1a and helium is placed in group 8a. the most likely reason for this is: a hydrogen and helium are both metals. b hydrogen has one outer shell electron and helium has a full valence shell of electrons. c hydrogen and helium are both gases. d hydrogen has one outer shell electron and helium has 8 electrons in its valence shell. question 2 (1 point) rank the following in order of increasing atomic radius 1. b 2. ga 3. tl

Explanation:

Question 1:

Hydrogen has one outer - shell electron and is placed in Group 1A as it can lose this electron to form a + 1 ion like other Group 1A metals. Helium has 2 electrons which fill its outer shell and is a noble gas, placed in Group 8A.

Atomic radius generally increases down a group and decreases across a period. B is in Group 13, Ga is in Group 13 below B, and Tl is in Group 13 below Ga.

Answer:

a. Hydrogen and helium are both metals. - Incorrect. Helium is a noble gas, not a metal.
b. Hydrogen has one outer - shell electron and helium has a full valence shell of electrons. - Correct.
c. Hydrogen and helium are both gases. - While true, it's not the most relevant reason for their group placement.
d. Hydrogen has one outer - shell electron and helium has 8 electrons in its valence shell. - Incorrect. Helium has 2 electrons in its valence shell.

Question 2: