Question

a Choose electron configurations for the following elements: group VIA element in the same period as 12Mg 12222p63s23p4 1222p33p1 12222p33p 4s-4p4 1s222p3 b The period 2 element in the same group as 1-CI ○ 1s22s2㎡ 1s225-2p3 1s22s2 1s2㎡2s2 The lowest-atomic-numbered metal in group IIA 15225 1s22s 2p 3 1s2 1522s

Answer 1

Electron configurations reflect an element's position on the periodic table; Sulfur (S) in the same period as Magnesium (Mg) would have the configuration 1s²2s²2p¶3s²3p´. Ionisation energy generally increases across a period due to an increasing nuclear charge.

Step-by-step explanation:

The electron configurations of atoms reveal their position in the periodic table and can be used to predict elemental properties such as ionisation energy patterns.

For example, a group VIA element in the same period as Magnesium (Mg) would have the electron configuration 1s²2s²2p¶3s²3p´, since it is two places to the right of Magnesium in the periodic table, which is known to have the configuration 1s²2s²2p¶3s². This corresponds to element Sulfur (S).

Furthermore, the first ionisation energy across a period increases due to a greater nuclear charge with the same energy level of valence electrons. Thus, for elements in period 2, starting from Lithium and moving towards Neon, one would expect a general increase in the first ionisation energy.