Predict a simple reaction from the outer electrons
Grade 10 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Sulfur is in group 16. How many electrons does one sulfur atom gain to reach eight outer electrons, Ari?
Nitrogen is in group 15. How many electrons does one nitrogen atom gain to reach eight outer electrons, Bo?
Chlorine is in group 17. How many electrons does one chlorine atom gain to reach eight outer electrons, Esme?
Aluminum is in group 13. Which ion is it predicted to form, Jun?
- Al³⁻, after gaining 3 electrons
- Al³⁺, after losing its 3 outer electrons
- Al¹³⁺, copying the group number
Sulfur is in group 16. Which ion is it predicted to form, Kira?
- S⁶⁻, gaining its 6 outer electrons again
- S²⁺, after losing 2 electrons from its outer shell
- S²⁻, after gaining 2 electrons to reach eight
Barium is in group 2 and iodine is in group 17. Which pair of ions is predicted, Luz?
- Ba²⁺ and I⁷⁻, since iodine gains its 7 outer electrons
- Ba²⁻ and I⁺, since the metal gains and the nonmetal loses
- Ba²⁺ and I⁻, since barium loses 2 and iodine gains 1
Sodium reacts with chlorine in a 1 to 1 pattern. Which other element should react with chlorine the same way, Pia?
- Magnesium, which sits right beside sodium in the same row
- Aluminum, the next metal along the same row
- Potassium, which also has 1 outer electron
Potassium (group 1) combines with sulfur (group 16). Which formula is predicted, Ren?
- KS₂, because the subscripts swap places
- K₂S, because two K⁺ cancel one S²⁻
- KS, because one of each pairs them
Calcium (group 2) combines with chlorine (group 17). Which formula is predicted, Tala?
- Ca₂Cl, because the subscripts swap places
- CaCl, because one of each pairs them
- CaCl₂, because one Ca²⁺ needs two Cl⁻
Lithium (group 1) combines with oxygen (group 16). Which formula is predicted, Zee?
- Li₂O, because two Li⁺ cancel one O²⁻
- LiO, because one of each pairs them
- LiO₂, because the subscripts swap places