The Ca2+ ion is larger than the Mg2+ ion.
The ionic radii are: 86pm for the Mg2+ and 114pm for the Ca2+.
Besides the fact that the Ca2+ has more electrons this can be explained by the principle of electron shielding. Electron shielding is when lower level electrons block the EFC(effective nuclear charge) from effecting the valence electrons of an ion. Ca2+has more electrons than Mg2+ so more electron shielding occurs.
CrCl6(AQ) + Mg(S) -> MgCl2(AQ) + Cr(S) CrCl6(AQ) + 3Mg(S) -> 3MgCl2(AQ) + Cr(S) Make sure both sides are balanced. The 3 in front of both of the Mg's is be cause 3*2=6, and you have to put a 3 in front to balance it out with the CrCl6,and the Mg's need to be balanced too so you another 3 in front of the Mg. Now the reaction is balanced.
Calcium(Ca), being a more reactive element, reacts with FeCl3 to produce CaCl2 and Iron(Fe).3 Ca + 2 FeCl3 ----> 3 CaCl2 + 2Fe
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Both are in the same group; accordingly, they have the same number of valence electrons (2).
The Mg2 plus cation has 10 electrons.
Fe 2plus is larger
The balanced equation for Ca + Mg(NO3)2 would be Ca + Mg(NO3)2 -> Ca(NO3)2 + Mg. This is a double displacement reaction, where the calcium (Ca) and magnesium (Mg) ions switch places with the nitrate ions (NO3).
2 Mg + 2 NaOH-------2 MgO + H2 + 2 Na 2 Al + 6 NaOH------2 Na3AlO3 + 3 H2
Each g has 1,000 mg, so 2 g are definitely larger than only 128 mg.
CrCl6(AQ) + Mg(S) -> MgCl2(AQ) + Cr(S) CrCl6(AQ) + 3Mg(S) -> 3MgCl2(AQ) + Cr(S) Make sure both sides are balanced. The 3 in front of both of the Mg's is be cause 3*2=6, and you have to put a 3 in front to balance it out with the CrCl6,and the Mg's need to be balanced too so you another 3 in front of the Mg. Now the reaction is balanced.
Calcium(Ca), being a more reactive element, reacts with FeCl3 to produce CaCl2 and Iron(Fe).3 Ca + 2 FeCl3 ----> 3 CaCl2 + 2Fe
mg + CuCl2 + MgCl2 + Cu Mg + Cu^+2 = Mg^+2 + Cu
An atom with two valence electrons, such as calcium (Ca), is most likely to form a cation with a charge of plus 2 by losing both electrons to achieve a stable octet configuration.
200 mg is 2 g
2CaCO3+Mg^2+--> CaMg(CO3)2+Ca^2+
Ca(OH )2 plus sulfuric acid yields water and CaSO4.
The oxidation state of magnesium in magnesium hydroxide is +2 no matter what reaction you are looking at.