12. Test
anion
A negative ion is called a (n)
false Shielding of the nucleus caused by the addition of the extra shells makes the outer electrons of larger atoms much easier to remove.
All atoms with the same number of electron shells have an equal electronegativity.
4 13 8 10
Balance the following reaction. Choose "blank" if no coefficient is needed. __C2H5 + __O2 → __CO2 + __H2O
blank 2 2 blank
Balance the following reaction. Choose "blank" if no coefficient is needed. __MgCl2 + __AgNO3 → AgCl + Mg(NO3)2
false
Electronegativity increases as the size of the atom increases.
Carbon is in group 4 and has 4 valence electrons.
How many valence electrons does carbon have?
Fluorine is in group 7 and has 7 valence electrons.
How many valence electrons does fluorine have?
lose 3 electrons The electron configuration of Boron is 1se2,2se2,2pe1. It will lose its n = 2 electrons to reveal the full 1s2 shell. This will make it a +3 ion.
How would B change to gain stability?
False because the electron configuration for beryllium is 1s22s2and the electron configuration of its ion is 1s2and the charge of its ion is +2.
In the following table, all the columns for the element beryllium are filled out correctly.
False because the electron configuration for calcium is 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 and the electron configuration of its ion is 1s2, 2s2, 2p6, 3s2, 3p6 and the charge of its ion is +2
In the following table, all the columns for the element calcium are filled out correctly.
False because the electron configuration for oxygen is 1s22s22p4 and the charge of its ion is -2.
In the following table, all the columns for the element oxygen are filled out correctly. (Beryllium is done as an example.)
valence
The electrons in the outer shell of an atom are called:
the valence electrons Valence electrons may be either s or p electrons (or both)
The electrons which are primarily responsible for chemical bonds are:
False
The energy needed to remove an electron from an atom is called electronegative energy.
hydrogen
Use the problem below to answer the question: How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is C + H2O → CO + H2 What substance are you expected to solve for?
K 2CrO 4 A compound's formula is neutral, therefore since K has a +1 charge and CrO4 has a -2 charge, the formula is K2CrO4, because that would make the charge equal to 0.
Using the charge on these ions and the idea of valence, predict the formula for the following: potassium chromate
attraction between opposite ions Two ions form and then, because bonding will neutralize the excess charge each atom feels, the atoms bond.
What causes the bonding of two atoms in an ionic bond?
high E.N., low E.N. low I.E., high I.E.
Which characteristics will probably yield an ionic bond? Each answer refers to two atoms, Atom X and Atom Y. Atom X is referred to first, and Atom Y is referred to second. (Select all that apply.)
N Electronegativity increases up a family group. N is at the top of its group.
Which element has the greatest electronegativity?
Ba Ionization energy decreases down a family group. Ba is lower than Be in its family.
Which element will have lower ionization energy?
https://assets.learnosity.com/organisations/328/49985be4-ca5b-43e7-97d9-acfe580f3f12.gif Electronegativity and ionization energy have a direct relationship. As one increases, the other increases. For instance, the element fluorine has the highest electronegativity and the highest ionization energy.
Which graph represents the relationship between electronegativity (E.N.) and ionization energy (I.E.)?
Mg Mg is in family II and will have a +2 charge. Chlorine has a -1 charge. This will result in a 1:2 combining ration: ㅤㅤㅤㅤㅤㅤㅤ1ㅤ2 ㅤㅤㅤㅤㅤㅤㅤ 2ㅤ2 +2ㅤㅤ-1} ≠0ㅤㅤ+2ㅤ-1 MgㅤㅤCl_____ => Mg Cl => MgCl2 or MgCls2
Which one of the following elements will combine with chlorine in a 1:2 ratio to give a formula of XCl2?
polar
molecule: a molecule with unequal electron sharing so that the molecule has partial positive and partial negative charges
