An atom with 2 protons, 3 neutrons, and 4 electrons has a charge of

It has a charge of -2 because it has 2 more electrons than protons meaning it has a negative charge of 2 which is -2. Neutrons don't effect charge.

( +1 +1 -1 -1 -1 -1) = -2

Each proton has a charge of +1 and each electron has -1.

2(1) - 4(1) = -2

2×-1.6×10^-19 C= -3.2×10^-19 C

Explanation:

charge on one proton is 1.6×10^-19 C

lets call this +q

therefore charge on on electron is -q

neutron does not have any charge, it is a neutral particle

Therefore the net charge will be

2q-4q= -2q

(q = 1.6×10^-19 C)

108

explanation:

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1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles