Question

periodic trends - atomic mass
the atomic mass describes the mass of each individual element.
atomic mass increases moving down each group and right across a period.
instructions: in the periodic table below, draw two arrows representing the direction that atomic mass increases across groups and periods.

Explanation:

Step1: Identify direction of increasing atomic - mass in groups

In a periodic - table group, atomic mass increases downwards. So, draw a vertical arrow pointing downwards for each group.

Step2: Identify direction of increasing atomic - mass in periods

In a periodic - table period, atomic mass increases from left to right. So, draw a horizontal arrow pointing to the right for each period.

Answer:

Draw vertical arrows pointing downwards for each group and horizontal arrows pointing to the right for each period on the given periodic - table grid.