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Writing Chemical Formulas- HW Question 3.25

Posted: Wed May 23, 2018 3:53 pm
by FizaBaloch1J
For example, 3.25 A asks to write the chemical formula for magensium arsenide.

For this, how exactly does one go about solving it. Do I look at the individual elements charge separately at first and then balance them? I'm pretty confused.

Re: Writing Chemical Formulas- HW Question 3.25

Posted: Wed May 23, 2018 4:07 pm
by Nina_A_Section1E
Mg commonly forms +2 ions since it has 2 valence e-, and Arsenic has 5 valence e-, so it needs 3 to fill its shell, according to the octet rule. So both elements' needs are met, use 3 Mg and 2AS to make As2Mg3!

Re: Writing Chemical Formulas- HW Question 3.25

Posted: Sun May 27, 2018 9:23 pm
by Madison Hacker 1L
For these types of questions, I like to think of them as like balancing chemical equations. Explained above, there are a certain number of electrons needed to complete each octet. By recognizing this, you can multiply to find the formula. Hope this helps!