Chemistry and ionic compound subscripts question?
kkkkkkkkkkkk989890, First, the overall rules: * Alkaline earth elements take a +2 charge (second column in the periodic table) * Halogens take a -1 charge (next to last column on the periodic table) * Group 3A metals can take various charges, but +3 is probably preferred * Alkali metal elements take a +1 charge (first column in the periodic table) * Nonmetals from group 6A take a -2 charge (third column from the right on the periodic table) So here we go: (a) an alkaline earth metal and a halogen 1. MX2 (M1X2) such as CaCl2 (b) an alkali metal and a halogen 2. MX (M1X1) such as LiCl (c) a metal from group 3A and a halogen 3. MX3 (M1X3) such as AlCl3 (d) an alkali metal and a nonmetal from group 6A 4. M2N (M2N1) such as K2O (e) an alkaline earth metal and a nonmetal from group 6A 5. MN (M1N1) such as MgO Hope that helped!
Chem question.periodic table?
it is e because all the 5A group elements have 5 electrons in their outer most shell or valance shell and need 3 more electron to fill valance shell according to octect rule
Chemistry questions help?
4. Metals in Group 1A of the Periodic Table are highly reactive metals that are soft and shiny. Why do these metals react violently with water and electronegative elements such as chlorine? In terms of their reactivity, solubility etc. compare the properties of the Group 1A elements with those of Group 2. Why are the salts that are products of such reactions inert? 5. The macroscopic physical and chemical properties of elements are related to the so-called valence electrons within the atoms. Compare and contrast the physical and chemical properties of the elements in Group I (the alkali earth elements) with those of Group VII. 6. The identity of any element is determined by the number of protons in the nucleus. The chemical properties of any element are determined by the electron configuration of the electrons. Explain why this is the case and why elements in the same group of the Periodic Table of Elements have similar chemical properties. 1. Explain in terms of the outer shells of electrons why at room temperature and pressure a. Oxygen and nitrogen are gaseous b. Sodium is a highly reactive shiny metal c. Argon, Helium and Krypton are unreactive gases 2. Explain in chemical terms what happens when I add first lithium then sodium, potassium then cesium to beakers of water. 3. Why are the elements on the left hand side of the periodic table never found as elements in nature but instead as compounds. 4. Why is gold an inert metal and found in nature in its native (elemental form) 5. In terms of electrons within atoms, what distinguishes metals in the periodic table of elements from non metals?
Chemistry homework help!!!!! what is the general formula for an ionic compound with the following?
1. General Formula: Metal Non-Metal (like sodium Chloride: NaCl) 2. General Formula: Metal Non-Metal2 (like Calcium Chloride: CaCl2) 3. General Formula: Metal2 Non-Metal (like Sodium Oxide: Na2O) 4. General Formula: Metal Non-Metal (like Calcium Oxide: CaO) IF you want to know how it works out, then you should know this. The charges on the ions formed from atoms determine the compound structure. Group 1: Charge is +1 Group 2: Charge is +2 Group 3: Charge is +3 Group 4: Charge is +-4 Group 5: Charge is -3 Group 6: Charge is -2 Group 7: Charge is -1 Now, when you combine a positive an negative charged ions, you EXCHANGE them. Thus, if you combine group1 and group 5, the compound will be Metal3 Non-Metal (like Na3N), but if you have like group 2 and group 6, then it will be Metal Non-Metal (not like this: Ca2O2) like CaO, the reason you dont put two 2's is that they cancel out. You dont need them. And so on.... Hope this was helpful enough to clear your doubts. Can i ask a favour in return? 10 points please?
What is the characteristic of the periodic table?
The modern periodic table was proposed by “Bohr”. It is also known as “Long form of periodic table”. The characteristics of modern periodic table are:The arrangement of elements in modern periodic table is based on their electronic configurations.The horizontal rows of elements in periodic table are called periods.There are 7 periods in modern periodic table.The elements in a period have consecutive atomic numbers. Example : in period 2 we have elements Li, Be, B, C, N, O, F and Ne having atomic no. 3 ,4 ,5 ,6 ,7 ,8 ,9 and 10.The vertical columns in a periodic table are called groups.There are 18 groups in modern periodic table.The elements in a group do not have consecutive atomic numbers. Example : in a group 2 we have elements Be ,Mg ,Ca ,Sr ,Ba and Ra with atomic no. 4 ,12 ,20 ,38 ,56 and 88.In the periodic table, metals have been separated from non- metals by some elements called “metalloids”.These metalloids are Boron(B), Silicon(Si), Germanium (Ge), Arsenic(As), Antimony(Sb), Tellurium(Te), and Polonium(Po).The metals lie on the left side of the metalloids whereas non- metals are on right side of the metalloids.The noble gases i.e, He, Ne, Ar, Kr, Xe and Rn are placed on the extreme right side of the periodic table.
Section on the periodic table composed of 8 groups including metals metalloids and nonmetals?????
here are some more science questions for you really smart people out there well i need lots of help in science and well here are some questions......elements that have similar physical or chemical properties are what???......elements between metals and nonmetals on the periodic table are what???......row of elements in the periodic table whose properties change gradually and predictably are what???...section on the periodic table composed of groups 3 through 12 are what??? plz help me these are the answers to choose from a.group b.representative elements c.metalloids d.period e.transition elements the FIRST person to answer all of these with REAL answers will get 10 points thanx every1 that helps me
Chemistry problem - hope that someone can help!!!!!!!!!!!!!!?
1. How many outermost electrons (valence electrons) would a Group II element have? 2 (II of group II indicates this) 2. How many electron shells would a Period 3 element have? 3 3. On which side of the Periodic Table do you find gases? right (at STP, N, O, F, Cl and noble elements in group 18) 4. On which side of the periodic table do you find non-metals? right (The elements generally regarded as nonmetals are: hydrogen (H) In Group 14: carbon (C) In Group 15(the pnictogens): nitrogen (N), phosphorus (P) Several elements in Group 16, the chalcogens: oxygen (O), sulphur (S), selenium (Se) All elements in Group 17 - the halogens All elements in Group 18 - the noble gases ) 5. On which side of the periodic table do you find insulators (poor conductors)? non-metals (share electrons unlike metals which have mobile valence electrons) 6. If an element had six valency (outermost) electrons, would it be a metal or a non-metal? these are group 16 elements - non-metals 7. Why are the Noble Gases (Group VIII) unreactive? because they already have full outer shells (full octet). so they don't have to react with metals like sodium, for example, to gain electrons to become stable. hope this helps;-D