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In the periodic table, identify an element (i) in the same period as magnesium but with larger atoms, (ii) in the same group as magnesium but with smaller atoms. - Leaving Cert Chemistry - Question (h) - 2015
Question (h)
In the periodic table, identify an element (i) in the same period as magnesium but with larger atoms, (ii) in the same group as magnesium but with smaller atoms.
Worked Solution & Example Answer:In the periodic table, identify an element (i) in the same period as magnesium but with larger atoms, (ii) in the same group as magnesium but with smaller atoms. - Leaving Cert Chemistry - Question (h) - 2015
Step 1
(i) in the same period as magnesium but with larger atoms.
Answer
To find an element in the same period as magnesium (which is in Period 3 of the periodic table) with larger atoms, we can look to the next element in Period 3 after magnesium, which is sodium (Na). Sodium has a larger atomic radius compared to magnesium due to its position in the periodic table.
Step 2
(ii) in the same group as magnesium but with smaller atoms.
Answer
For the second part, we need an element in the same group as magnesium (Group 2) but with smaller atoms. This can be identified as beryllium (Be). Beryllium is above magnesium in Group 2, and therefore it has a smaller atomic radius owing to its higher atomic number and position on the periodic table.