Atoms do not have a radius. A helium atom has a nucleus composed of at least two protons and maybe one or two neutrons. A magnesium atom nucleus (and every other atom on the Periodic Table other than hydrogen) is BIGGER than a helium nucleus. So if you look at it that way...magnesium is larger than helium
Magnesium has a larger atomic radius than aluminum. This is because magnesium has one more electron shell than aluminum, leading to a greater distance between the nucleus and the outer electrons.
Calcium has a larger atomic radius than magnesium and a smaller atomic radius than potassium. This trend is due to the increase in number of protons and electrons as you move across the period on the periodic table from magnesium to calcium to potassium.
The atomic radius of oxygen is about 60 picometers. Therefore, atoms of elements such as hydrogen (25 picometers) and helium (31 picometers) have smaller atomic radii than oxygen.
An aluminum ion has a smaller radius than a magnesium ion because aluminum loses an additional electron compared to magnesium, resulting in increased nuclear charge and greater attraction to the remaining electrons.
The atomic radius of calcium is larger than magnesium but smaller than potassium. This trend is consistent with the periodic trend across Group 2 elements where atomic radius increases down the group due to additional electron shells. Additionally, going across a period from left to right, atomic radius decreases due to increasing nuclear charge pulling electrons closer.
Magnesium has a larger atomic radius than aluminum. This is because magnesium has one more electron shell than aluminum, leading to a greater distance between the nucleus and the outer electrons.
Magnesium isn't smaller than chlorine, it's larger. The atomic radius for magnesium is 145 pm and the atomic radius for chlorine is 79 pm. Both magnesium and chlorine are in the third period of the periodic table. The trend for atomic radius is that the elements generally get smaller as you move from left to right across the table in the same period.
Calcium has a larger atomic radius than magnesium and a smaller atomic radius than potassium. This trend is due to the increase in number of protons and electrons as you move across the period on the periodic table from magnesium to calcium to potassium.
The atomic radius of oxygen is about 60 picometers. Therefore, atoms of elements such as hydrogen (25 picometers) and helium (31 picometers) have smaller atomic radii than oxygen.
An aluminum ion has a smaller radius than a magnesium ion because aluminum loses an additional electron compared to magnesium, resulting in increased nuclear charge and greater attraction to the remaining electrons.
Sulfur has a larger atomic radius than magnesium. This is because as you move down a group in the periodic table, atomic radius increases due to the addition of more electron shells. Magnesium is higher up in the periodic table than sulfur, so it has a smaller atomic radius.
Examples are: Be, Al, Ti, V, Mn, Co, Ni etc.
The radius is smaller than the ulna
The atomic radius of calcium is larger than magnesium but smaller than potassium. This trend is consistent with the periodic trend across Group 2 elements where atomic radius increases down the group due to additional electron shells. Additionally, going across a period from left to right, atomic radius decreases due to increasing nuclear charge pulling electrons closer.
Smaller
Bromine has a larger atomic radius than magnesium. Atomic radius generally increases as you move down a group on the periodic table, so bromine, being below magnesium, has a larger atomic radius.
Element M is likely calcium. It is more reactive than magnesium and has a smaller radius than barium, making it a good fit for the given properties. Calcium forms a compound MCl2 when reacting with chlorine.