Electrons and protons, but not neutrons.
Explanation:
5N right because -15N for left plus +20N for right = +5N
In Flourine-19, you can determine that the number of Neutrons is 10.
Now, if you look at Neon-20, you subtract its mass by the number of protons, leaving you with 10.
Therefore, Neon-20 has the same number of neutrons as Flourine-19.
At STP, one mole of gas occupies 22.4 L of space. Assuming the conditions conform to STP
volume CO2 = 0.5 mol * 22.4 L/1 mol
= 11.2 L
= 10 L
The answer with 1 significant figure is 10 L of CO2
Rare earth metals are a group of 17 elements - lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium - that appear in low concentrations in the ground
