There are 4. Do you mean molecules?
For each ionic compound formula, identify the main group to group 17 (VIIA).
Group17 (VIIA) is the primary group to which X belongs in each ionic combination with the formula CaX2. X is undoubtedly an electron acceptor. It is capable of taking an electron. We determine that X must be in the oxidation state -1 by looking at the chemical formula. The neutral ionic compound's total number of oxidation states is zero. Since calcium has an oxidation state of +2, we must identify the element that contains an anion with an oxidation state of -1. The halogens have a strong propensity to pick up an electron and create an anion. X belongs to group17 (VIIA) as a result.
To know more about ionic compound formula refer the link:
brainly.com/question/9597623
#SPJ4
The goal of an element is to obtain a noble gas configuration (obtaining a full valence shell). Therefore, certain elements will either gain or lose electrons in order to obtain this full valence shell. In the case of sodium chloride, it is easy for sodium (having one valence electron) to give up its one electron. Chlorine (having seven valence electrons) wants sodium’s electron because it completes its outer shell and chlorine obtains this noble gas configuration. Ionic bonds always involve a transfer of electrons.
Answer:
.54 mol
Explanation:
Using the ΔH given for the balanced reaction, convert kilojoules to moles of CO2 using the stoichiometric ratio:
250 kJ×(6 moles CO22803 kJ)=0.5351 moles CO2
The answer should have two significant figures, so round to 0.54 moles CO2.
Notice that coefficients in stoichiometric equations (indicating numbers of moles) are exact, so they do not constrain the number of significant figures.
I don't understand the question
