Question

you might need: calculator, periodic table
hypobromite is a polyatomic ion with formula bro⁻. it is produced by the immune system to kill bacteria.
how many protons and electrons does a bro⁻ ion contain?
protons
electrons

Explanation:

Step1: Find protons of Br and O

Look up atomic numbers. Br has 35 protons, O has 8 protons.

Step2: Calculate total protons

Add protons of Br and O. $35 + 8=43$ protons.

Step3: Find electrons of neutral Br and O

In neutral atoms, number of electrons = number of protons. So Br has 35 electrons, O has 8 electrons.

Step4: Calculate electrons of $BrO^-$

The ion has a -1 charge, so add 1 electron. $(35 + 8)+1 = 44$ electrons.

Answer:

43 protons
44 electrons