Respuesta :
1. A) Beryllium
Elements in the same column on the periodic table have similar properties
2. A) Periodic Law
That is the definition of Periodic Law
Answer:
For 1: The correct answer is Option A.
For 2: The correct answer is Option A.
Explanation:
- For 1:
Elements in a periodic table are distributed in 7 Periods and 18 Groups.
Periods are the horizontal lines (rows) in a periodic table.
Groups are the vertical lines (columns) in a periodic table.
Elements that belong to same group show similar chemical properties because they have same number of valence electrons.
Magnesium is the 12th element that belongs to group 2 of the periodic table.
Elements in group 2 of the periodic table are Beryllium, Magnesium, Calcium, Strontium, Barium and Radium.
Hence, the correct answer is Option A.
- For 2:
For the given options:
Option A: Periodic law
This law states that the elements are arranged according their atomic numbers will fall in recurring groups. This is so because elements with similar properties occur at regular intervals. This is the reason they are arranged in same group.
Option B: Ionization energy
Ionization energy is defined as the energy required to remove an electron from the outermost shell of an isolated gaseous atom. It is represented as [tex]E_i[/tex]
[tex]X(g)\rightarrow X^+(g)+1e^-;E_i[/tex]
Option C: Ionic size
Ionic size is defined as the the distance between the nucleus and the electron present in the outermost shell of an ion.
Option D: Electronegativity
Electronegativity is defined as the tendency of an element to attract the shared pair of electron towards itself in a compound.
Hence, the correct answer is Option A.
