Determine the number of valence electrons for magnesium through the use of this table. mg =

Answer : The number of valance electrons for magnesium are 2.

Explanation :

The given element is magnesium (Mg). The element magnesium belongs to group 2 and period 3.

The atomic number of magnesium is 12 and the atomic mass is 24.

The number of electrons present in magnesium are 12.

So, the electronic configuration of magnesium will be,

From the electronic configuration we conclude that, the outermost shell of magnesium is '3s' and the number of electrons present in '3s' is 2. And we know that the number of electrons present in outermost shell is known as valance electrons.

Hence, the number of valance electrons for magnesium are 2.

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.