You need to write the formula. however, do not worry about trying to make the numbers smaller or as subscripts. h2o would be how water will show up correctly. what is the formula for the ionic compound made from f and be?

Here are some steps i know from my teacher:

When you write a formula from a home you must follow these rules

1) Write down the name you must follow these rules

2)Write down the symbols for the elements and group in the compound of elements

3)Write down the valency

4)Adjust the number of atoms of each element or group valency is the combining capacity of elements with one another.

4d^55s^1 ( third choice)