Answer:
this one is hard
Explanation:
but it's iron because the sodium so yea there u go.
Any given experiment has numerous control variables, and it's important for a scientist to try to hold all variables constant except for the independent variable. If a control variable changes during an experiment, it may invalidate the correlation between the dependent and independent variables.
It’s copied and pasted from google so make sure to put it in your words :)
Atomic radius is the distance from the atom's nucleus to the outer edge of the electron cloud.