What ion will be formed by the selenium atom shown below when it has a stable set of valence electrons?
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selenium is in group 16 which means it has 6 valence electrons...
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it's definitely not c
is it easier to lose 6 electrons or to gain 2 electrons?
wait.. i dont get it
i'll lead you through this, but you can't jump to conclusions
electrons means negative subatomic particles. so isnt the answer between c and d?
okay. an atom can either lose or gain electrons. an atom always wants to get 8 valence electrons. this atom is in group 16 which means it has 6 valence electrons
so it wants to get to 8 valence electrons
it can either lose 6 or gain 2. What is going to happen?
its going to gain 2 because its easier?
yes. if you gain 2 electrons what does that mean in terms of charge? Remember that a normal atom has a neutral charge of 0.
arg. i dont know. the charge increases?
No. You were right. electrons are negatively charged subatomic particles (charge is -1). You had a neutral atom to start with, and all of a sudden you have 2 of these negative electrons. What is the charge?
ok so the charge decreases to 6?
No. you started with zero (neutral atom). You gained 2 electrons. 1 electron holds -1 charge. What does that mean?