Once you have filled in all the gaps on a separate sheet of paper, enter the fou

Question

Once you have filled in all the gaps on a separate sheet of paper, enter the four missing element symbols in the first row of the table into the answer box below.

You can open the first hint to view a video that steps you through filling in the first column of the table.

Enter the four missing symbols for the first row of the table from left to right, separated by commas, into the answer box below.

Use the stacked super/subscripts button (available in the templates button menu above the answer entry box) to enter the symbols in the following form:

mass numberatomic numberSymbol, or for example, 35/17Cl.

Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207

Explanation / Answer

Symbol 7935Br 2555Mn 11248Cd 22286Rn 20782Pb Protons 35 25 48 86 82 Neutrons 44 30 64 136 125 Electrons 35 25 48 86 82 Mass no. 79 55 112 222 207

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