The one on top is corrrect because the cell diagram will always contain one object or more
Explanation:
10 valence electron are there
Protons: <span>The mass of the proton is about 1,840 times the mass of the electron and slightly less than the mass of the neutron.
Electrons: </span><span>Electrons are arranged around the nucleus of atoms in regions called electron clouds or electron orbits.
Neutrons: </span><span>A neutron is one of two particles found inside the nucleus (central part) of an atom. The other particle is called a proton. Electrons are particles that move around an atom outside the nucleus.</span>
1000 is the answer to the queshtion
Explanation:
12)
a) Sodium + oxygen = ?
When sodium reacts oxygen its forms sodium oxide as a product.
![4Na(s)+O_2(g)\rightarrow 2Na_2O(s)](https://tex.z-dn.net/?f=4Na%28s%29%2BO_2%28g%29%5Crightarrow%202Na_2O%28s%29)
b) magnesium + fluorine = ?
When magnesium reacts with fluorine its forms magnesium fluoride as a product.
![Mg(s)+F_2(g)\rightarrow MgF_2(s)](https://tex.z-dn.net/?f=Mg%28s%29%2BF_2%28g%29%5Crightarrow%20MgF_2%28s%29)
13)
a) ![2HgO(s)\overset{\Delta }\rightarrow 2Hg(l)+O_2(g)](https://tex.z-dn.net/?f=2HgO%28s%29%5Coverset%7B%5CDelta%20%7D%5Crightarrow%202Hg%28l%29%2BO_2%28g%29)
Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.
b)![2H_2O(l)\overset{Electricity}\rightarrow 2H_2(g)+O_2(g)](https://tex.z-dn.net/?f=2H_2O%28l%29%5Coverset%7BElectricity%7D%5Crightarrow%202H_2%28g%29%2BO_2%28g%29)
The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.