Chemistry homework question! Plz help!?

Posted on 2015-09-02 06:02:00 in Chemistry by LECY

1.) Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the selenide ion, Se2-.

2.) Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with Kr.

3.) Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the strontium ion, Sr2+.

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