Chapter 2-3 Post-Assignment
an attraction between ions of opposite charge
An ionic bond involves _____.
5 - The atomic number is equal to the number of protons.
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many protons does boron have?
Wrong again, Ralph. Both bonds are nonpolar.
Dr. Haxton says the O-O bond is polar and the C-C bond is nonpolar. A good student would say ...
the first shell shouldn't have 3 electrons.
Dr. Jones says an atom has 3 electrons in the first shell and four electrons in the second shell. Someone should tell Dr. Jones that ...
6 - Atomic number is the number of protons in an atom.
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
covalent
What type of bond is joining the two hydrogen atoms?
single (nonpolar) covalent
What type of bond joins the carbon atom to each of the hydrogen atoms?
O, N, C, H
Which answer correctly ranks the atoms in terms of decreasing electronegativity (the highest electronegativity first)?
The C that's in C=O.
Which atom in the pictured molecule will have the strongest partial positive charge?
probability model
Which model most accurately represents the current view of the structure of the atom?
Oxygen is more electronegative than hydrogen.
Which of these figures correctly illustrates the nature of the bonding of H2O?
These atoms are isotopes.
Which of these refers to atoms with the same atomic number but different atomic masses?
The number of protons is equal to the number of electrons
Which of these relationships is true of an uncharged atom?
None of these. Elements are defined by the number of protons.
Which statement is most useful in explaining why chemists assign atoms to chemical elements by counting protons?
Electrons determine the atom's size.
Which statement is true of atoms?
The atom is in the excited state. An electron will move from the outer to the inner shell. The atom has more than one valence electron.
Which statement is true of the atom shown in the diagram?
The valence shell has higher energy than other occupied shells.
Which statement is true of the energy levels of electrons in shells?
double covalent
A(n) _____ bond joins these two oxygen atoms.
molecule
A(n) _____ refers to two or more atoms held together by covalent bonds.
C; it has 6 protons.
An atom has 6 electrons, 6 protons, and 6 neutrons. You can tell that this atom belongs to the element _____ because
10 neutrons
An atom has 8 protons, 8 neutrons, and 8 electrons. Another isotope of the same element might have ...
are different ions
Atoms with the same number of protons but with different electrical charges _____.
10 - Atomic mass is equal to the number of protons plus the number of neutrons (19-9 = 10).
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?
H-N
If you want a molecule that is highly polar, look for one that contains:
ionic
In salt, what is the nature of the bond between sodium and chlorine?
an atom has too many neutrons.
Radioactive decay is likely to occur when ...
2
The innermost electron shell of an atom can hold up to _____ electrons.
8 neutrons in the nucleus.
The mass number of an atom is 15, and its atomic number is 7. The atom probably has...
4
This atom can form up to _____ single covalent bond(s).
the same number of protons.
Two atoms always represent the same element if they have ...
O-H
Use your knowledge of electronegativity to pick out the most polar bond in the list below.
the number of electrons in the outermost electron shell
What determines the types of chemical reactions that an atom participates in?
