Just look it up on goog^le or a chart
Answer:
An electron is a negatively charged component of an atom
the proton is a positively charged body.
Explanation:
Answer:
Sr or Strontium
Explanation:
sr: strontium has atomic radius of 255pm
cu: copper has an atomic radius of 128pm
they teach you in chem how to do it based off the chart but I don't remember that method