Which of the Following Statements Is/are True of the Group

Multiple Choice

Which of the following statements is/are true of the Group 1A elements of the periodic table?
1) Lithium, sodium, potassium, rubidium, cesium, and francium are the most reactive of the metals.
2) Hydrogen behaves as a nonmetal because the electron in its small 1s orbital is bound very tightly to the nucleus.
3) The first ionization energy of the elements decreases and the atomic radius increases as one moves down the group.

A) ​1 only
B) ​2 only
C) ​3 only
D) ​1, 2, and 3
E) ​1 and 2