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VIIA
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Why are group1 and 7 found as compounds?
Group 1 elements have very low electronegativies and group 7 elements have very high electronegativities, so that both are reactive with almost every other element, the group 1 elements by donating electrons and the group 7 elements by accepting electrons.
Does covalent compounds have a high or low electronegativity?
In comparison with ionic bonds, the difference in electronegativities of elements in a covalent bond have a lower difference in electronegativities. A covalent bond occurs between two nonmetals that have a difference in electronegativities that is 1.7 or less. Usually an ionic bond has a difference in electronegativities that is greater than 1.7, but not always.
Why group 1 and group 2 elements do not occur free in nature?
Group 1 and group 2 elements are reactive metals and react readily with water. They also react readily at high temperatures with oxygen. Over the millenia any free deposits would react to form compounds.
Why do chemists use compounds instead of group 1 and 7 elements?
It is because the group 1 and 7 elements have a high reactivity. The reactivity is far too high to use on there own because the elements in these groups react with air and/or water.
Which group of elements has very high ionization energies and very low electron affinities?
Group 8 (noble gases) have the highest first ionization energy because they are already stable and don't want to lose any electrons. Ignoring the noble gases, however, group 7 halogens (F, Cl, Br, I, etc.) have the highest first ionization energy. That's because these elements have seven valence electrons, and they don't want to give up any electrons - they want another one!
Why are group1 and 7 found as compounds?
Group 1 elements have very low electronegativies and group 7 elements have very high electronegativities, so that both are reactive with almost every other element, the group 1 elements by donating electrons and the group 7 elements by accepting electrons.
Does covalent compounds have a high or low electronegativity?
In comparison with ionic bonds, the difference in electronegativities of elements in a covalent bond have a lower difference in electronegativities. A covalent bond occurs between two nonmetals that have a difference in electronegativities that is 1.7 or less. Usually an ionic bond has a difference in electronegativities that is greater than 1.7, but not always.
Why group 1 and group 2 elements do not occur free in nature?
Group 1 and group 2 elements are reactive metals and react readily with water. They also react readily at high temperatures with oxygen. Over the millenia any free deposits would react to form compounds.
Why do chemists use compounds instead of group 1 and 7 elements?
It is because the group 1 and 7 elements have a high reactivity. The reactivity is far too high to use on there own because the elements in these groups react with air and/or water.
Why are group 7 and group 1 elements usually found as compounds?
These elements are highly unstable because of for group1- IP is low and for group 7 electron affinity is high
Which group of elements has very high ionization energies and very low electron affinities?
Group 8 (noble gases) have the highest first ionization energy because they are already stable and don't want to lose any electrons. Ignoring the noble gases, however, group 7 halogens (F, Cl, Br, I, etc.) have the highest first ionization energy. That's because these elements have seven valence electrons, and they don't want to give up any electrons - they want another one!
Why beryllium and magnesium form polymeric hydride?
Because the electronegativities values of Be and Mg are high in comparission of other elements of the group. These two metals form poler covalent bond with hydrogen and due to polarity the units of these hydrides are linked to gather in the form of chain by hydrogen bond. so thier hydrides are called polymeric hydrides.
Why some elements do not have chemical bonds?
Elements such as helium and neon are noble gases and ave a full set of 8 electrons in their outer shell. this means they wont form covalent bonds. they also have high electronegativities so they wont react with acids or form ionic compounds.
When atoms in a covalent bonds have a rather high difference in their electronegativities the bonds is said to be?
polar
Why are bonds in most covalent compounds polar?
Electronegativity of an atom determines how it will share the electrons in a covalent bond. If an atom has a high electronegativity and it is bonded to an atom with a low one, the shared electrons will stay closer to the one with higher electronegativity. This molecule will be polar. If two atoms are bonded with similar electronegativities, the electrons will be shared evenly and it will be nonpolar. Nonpolar bonds are uncommon because there are many atoms with different electonegativities, so the chance that they are very close is low. Basically kid, if you are using Holt Rinehart and Winston chapter test/quiz for covalent compounds, the answer is A) one atom usually attracts electrons more strongly than the other (varying electronegativities) YAY!!
What does the presence of a polar covalent bond show about the electronegatives of its two atoms?
(apex!) the electronegativities of the two atoms are NOT equal.
When atoms in a covalent bond have a rather high difference in the electronegativities the bond is set to be?
A polar covalent bond.
