Which of the following groupings contains only representative elements?

Naturally occurring magnesium has the following isotopicabundances:

What is the symbol of the element in Group 4A(14) and Period 2?

Groups of elements in the periodic table have similar O physical properties crystal formations chemical reactivity O melting points

Can I get help with the following question please

Silicon is the foundation of today's Microelectronics.a) Indicate which other elements from group IV of the periodic table find applications in electronics, pointing out their usefulness.b) Similarly, composite materials using elements from groups III-V are widely used. Name at least 3 of these compounds, exemplifying their respective applications.

= ===|= | にm▼=, (13 In the compound zinc phosphide, what is the charge In the compound zinc phosphide, what is the charge on the zinc ion? on the phosphide ion? 5. Explain why a 3:2 ratio of ions is necessary for the compound zinc phosphide. 6. Is there any other ratio of zinc and phosphorus ions that could exist? For instance, could you have Zn,P or ZnP,? Explain your answer 7. Explain why you don't need to specify the number of ions in the compound you are naming ionic substances like those in Model 2. 8. Describe how the names of the nonmetal elements in Model 2 are changed when they are in their anion forms.

Which of the following chemical formulas are NOT written correctly?   (a) F3P (b)NH4+ (c) Fe(NO3)2 (d) H2S (e) All of these are written correctly