Question

1. element symbol with charge?

type a response

1. overall charge?

type a response

1. element symbol and charge?

type a response

(left chart: numbers 26,27,28,29,30,31, al³⁻,32, +19, -18,33,34,35,36,37,38,s,39,40,41,42,i⁻,43, +26, -23,44,45,46,47,48,49,ba²⁺,50 in a grid)

Explanation:

Question 19:

From the left table, we see \( \text{Al}^{3+} \) (aluminum ion) and \( \text{Ba}^{2+} \) (barium ion). A common element symbol with charge here is \( \text{Al}^{3+} \) or \( \text{Ba}^{2+} \); \( \text{Al}^{3+} \) is a typical example.

For a compound (or ion - group) with balanced charges, the overall charge is determined by summing individual charges. If we consider a neutral compound, overall charge is \( 0 \). If it's an ion, we sum the charges. But from the table, if we take a neutral species, overall charge is \( 0 \).

From the table, we have \( \text{Ba}^{2+} \) (barium with \( +2 \) charge) or \( \text{Al}^{3+} \). \( \text{Ba}^{2+} \) is a clear example here.

Answer:

\( \text{Al}^{3+} \) (or \( \text{Ba}^{2+} \), etc. from the table)

Question 20: