Question

which of the following statements is true about ions?
o a anions are positively charged ions.
o b cations are common among nonmetals.
o c when an anion forms, more electrons are transferred to it.
o d charges for ions are always written as numbers followed by a plus or minus sign

question 34 (1 point)
in which of the following sets are the charges given correctly for all the ions?
o a k, sr2, o2-
o b na, mg, al*
o c rb, ba2, p3+
o d n, o2, f3-

question 35 (1 point)
in which of the following groups of ions are the charges all shown correctly?
o a ca2, al3, br-
o b na*, i, rb-
o c k2, f, mg2+
o d li, o2, s2+

Explanation:

Question 33

• Anions are negatively charged ions (so option a is wrong).
• Cations are common among metals (so option b is wrong).
• When an anion forms, electrons are gained (transferred to it), so option c is correct.
• Charges for ions are written as a plus or minus sign followed by a number (for single - charge ions like \(H^+\)), or the number followed by the sign (for multi - charge ions like \(Fe^{3+}\)), but it's not "always" numbers followed by sign (so option d is wrong).

• For option a: \(K^+\) (Group 1A, + 1 charge), \(Sr^{2+}\) (Group 2A, + 2 charge), \(O^{2 -}\) (Group 6A, - 2 charge) are all correct.
• For option b: \(Mg\) should be \(Mg^{2+}\) (Group 2A) and \(Al\) should be \(Al^{3+}\) (Group 3A), so this option is wrong.
• For option c: \(Rb\) should be \(Rb^+\) (Group 1A), \(Ba\) should be \(Ba^{2+}\) (Group 2A), \(P\) should be \(P^{3 -}\) (Group 5A), so this option is wrong.
• For option d: \(N\) should be \(N^{3 -}\) (Group 5A), \(F\) should be \(F^-\) (Group 7A), so this option is wrong.

• For option a: \(Ca^{2+}\) (Group 2A), \(Al^{3+}\) (Group 3A), \(Br^-\) (Group 7A) are all correct.
• For option b: \(Rb\) should be \(Rb^+\) (Group 1A), so this option is wrong.
• For option c: \(K\) should be \(K^+\) (Group 1A), so this option is wrong.
• For option d: \(Li\) should be \(Li^+\) (Group 1A), \(S\) should be \(S^{2 -}\) (Group 6A), so this option is wrong.

Answer:

c

Question 34