Out of the following elements H, Be, 11 Na 2Mg.
[a] Write the pair elements having similar chemical properties.
[b] State the group number of each pair
Id Name one other element belonging to each of these groups.
Answers
Answer:
Answer➡
Lithium and Magnesium
A diagonal relationship exists between certain pairs of diagonally adjacent elements in the second and third periods. These are the first 20 elements in the periodic table.
For example, pairs lithium (Li) and magnesium (Mg), beryllium (Be) and aluminium (Al), boron (B) and silicon (Si), etc are exhibiting similar properties. Boron and Silicon are both semiconductors.
Explanation:
1_) lithnium and magnesium.
2 Answer
➡Out of the elements H 1 be 4 NA 11 and MG 12 a write the pair of elements having similar chemical properties B state the group number of each pair C Name one another element belonging to each of these groups
The electronic configuration of the elements are as follows : H (Z = 1) 1, Be (Z = 4) 2, 2, Na(Z = 11) 2, 8, 1, Mg (Z = 12) 2, 8, 2. (a) Elements Be and Mg have similar chemical properties since they have two valence electrons.
➡Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3. (b) Na has the largest atomic radius as the atomic radius decreases across the period.(c) As we move from left to right in a period the chemical reactivity of a metal decreases and of non - metal increases. Here given are metals and hence Na is most reactive as it is the first element of period
3) Answer
➡Both hydrogen (H) and sodium (Na) belongs to group 1 whereas both beryllium (Be) and magnesium (Mg) belongs to group 2. Lithium is another element which belongs to group 1 and calcium is another element that belongs to group 2 of the periodic table. )
➡Calcium is an element with atomic number 20
Out of the elements H be Na and Mg write the pair of elements having similar chemical properties
➡Calcium is an element with atomic number 20 stating reason answer each of the following
Why do we classify elements
Based on the group valency of elements
Out of the elements H l be 4 Na ll and Mg(12)