Sodium - metallic bonding
Oxygen - covalent bonding
Sodium chloride - ionic bonding
Magnesium oxide - ionic bonding
Nitrogen fluoride - covalent bonding
Aluminium - metallic bonding
Calcium hydroxide - ionic bonding
Silicon fluoride - covalent bonding (not 100% sure on this one)
Chlorine - covalent bonding
Potassium oxide - ionic bonding
Answer:
The two complex numbers are 
Explanation:
We have to form two complex numbers of the form
such that and d are irrational numbers and b and c are rational numbers.
We know that 
are irrational numbers.
5 and 6 are rational numbers.
We put
Thus, the two complex numbers are:
atoms are made of 3 types of sub atomic particles- protons, neutrons and electrons
from these 3 particles, electrons are responsible for participating in chemical bonds. therefore chemical properties of elements are based on the number of electrons present.
valence electrons are the number of electrons in the outermost energy shell that are involved in chemical bonds.
atoms with same number of valence electrons are grouped in to columns called groups.
therefore elements of the same group have same number of valence electrons, hence similar chemical properties.
from the options given
only Be and Mg belong to the same group they both belong to group 2 with 2 valence electrons
therefore Be and Mg have similar chemical properties
answer is
1) Be and Mg
The answer is the mass number! (:
