Question

part b: periodic table basics

1. the vertical columns in the periodic table are called

a) periods
b) families/groups
c) rows
d) sections

1. elements in the same group/family usually share:

a) the same number of protons
b) similar chemical properties
c) the same atomic mass
d) no similarities

1. which element is in group 1, period 2?

1. the atomic number tells you the number of ______ in an atom.

Explanation:

Question 5

In the periodic table, horizontal rows are called periods, while vertical columns are called groups or families. Rows are horizontal, so options a and c are incorrect. "Sections" is not the correct term for vertical columns. So the correct answer is b.

Elements in the same group (family) have the same number of valence electrons, which leads to similar chemical properties. The number of protons (atomic number) is unique to each element, so a is wrong. Atomic mass varies within a group, so c is wrong. Elements in the same group do have similarities, so d is wrong. Thus, the correct answer is b.

The periodic table's groups are vertical columns (Group 1 is the first vertical column) and periods are horizontal rows (Period 2 is the second horizontal row). Group 1, Period 2 corresponds to the element Lithium (Li). Let's confirm: Period 2 elements are Li, Be, B, C, N, O, F, Ne. Group 1 of Period 2 is Li.

Answer:

b) families/groups

Question 6