$($a$)$ The following $3$D model represents a common polyatomic anion that has its usual charge. Give the formula, including charge, and the name for the ion.

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$($b$)$ How many protons and how many electrons are there in this anion? protons$=$ electrons $=$

$($c$)$ What is the formula for the compound formed between this anion and the rubidium ion?

$($d$)$ What is the name of the compound?