Half reactions
2Li > 2Li+ + 2e-
H2 + 2e- > 2H-
Li+ lithium ion
H- hydride ion
Ionic bond is formed between positive and negative ions.
Positive ion is known as cation (electropositive metal)
Negative ion is known as anion ( electronegative non-metal)
The bond formed between a metal (positive ion) and non-metal (negative ions) is known as Ionic bond.
Ionic form is formed when one or more electrons from the valence shell of an atom (electropositive metal ) are completely transferred to the valence shell of another atom (electronegative non-metal). Ionic bonding is the complete transfer of valence electron(s) between oppositely charged atoms.
For example: Bond between NaCl(sodium chloride) is an ionic bond in which Na (sodium ) is positive ion(metal) which have +1 charge and Cl (chlorine) is negative ion(non-metal) which have -1 charge and the bond formed between Na+ and Cl- is ionic bond.

Given the mass of CO2 =15.02 g
Moles of
=
Mass of H2O = 2.458 g
Moles of
=
Moles of C = 
Moles of H = 
Mass of C in the sample = 
Mass of H =
=0.275 gH
Mass of O in the sample = 5.467 g - (4.095 g +0.275 g) = 1.097 g O
Moles of O = 
Simplest mole ratios of the elements in the compound:

Therefore the empirical formula of the compound is 
Answer:
Explanation:
The atomic radius of elements are used to estimate the sizes of elements. The atomic radius is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
To solve this problem we will obtain the atomic radius values of the given elements from a standard atomic radius table;
Si 111 pm
P 98 pm
Cl 79 pm
S 87pm
pm = picometer
We see that chlorine has the least atomic radius