Use the periodic table to answer the question. * 1 point

Question

Which Statement about magnesium [Mg) and calcium [Cal is correct?
• PERIODIC TABLE OF THE ELEMENTS
H
Ho
Li
CN OF Ne
Na Mg
Al
Si
S
Cl.
Ar
K
Ca Sc Ti V. Cr Mn Fe Co Ni Cu Zn Ga Ge As Se
Br
Kr
Rb Sr
Ze. Nb Mo Tc Ru Rh Pd Ag Cd in Sn
Sb
Te
Xe
Cs Ba
Hf Ta W Re Os Ir Pt Au Hg TI Pb
Bi
Po
At Rn
Fr
Ra
Rf Db 5g Bh Hs Mt Uun Un Ub
La Ce Pr Nd Pm 5m Eu Gd Tb Dy Ho Er Tm Yb Lu
-Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No L.
• They are both classified as noble gases.
They both have the same number of valence electrons.
They both have the same number of electron shells.

Answer 1

To analyze the statements about magnesium (Mg) and calcium (Ca), we need to understand their positions in the periodic table:

1. Classification: Magnesium (Mg, atomic number 12) is classified as an alkaline earth metal, while calcium (Ca, atomic number 20) is also classified as an alkaline earth metal. Therefore, the statement "They are both classified as noble gases" is incorrect.

2. Valence Electrons: Both magnesium and calcium have 2 valence electrons, as they are both in group 2 of the periodic table. Thus, the statement "They both have the same number of valence electrons" is correct.

3. Electron Shells: Magnesium has 3 electron shells, while calcium has 4 electron shells since it has a higher atomic number and is placed in the next period. Therefore, the statement "They both have the same number of electron shells" is incorrect.

In conclusion, the correct statement is: They both have the same number of valence electrons.