Grab a Periodic Table!
For starters, you should know that beryllium's chemical symbol is
Now, you should also know that the Periodic Table is divided into horizontal rows that are called periods and vertical columns that are called groups.
If you managed to locate the element box for beryllium, you should be looking at this
To find the period in which beryllium is located, look for the row that contains its element box. Start counting down from the top-left element box, i.e. from
To find the group in which beryllium is located, look for the column that contains its element box. Start counting to the right from the top-left element box. Beryllium is located in group