Option 1
1. Type of chemical bonding in the compound H2O:
a) covalent nonpolar
b) ionic
c) covalent polar
d) metallic
2. The most electronegative chemical element:
a) Br b) Cl c) I d) P
3. The charge of the calcium ion is:
a) 2+ b) 3+ c) 2- d) 3-
4. A completed outer electron layer has an atom of the chemical element:
a) Not b) Na c) S d) H
5. The number of common electron pairs between atoms in an O2 molecule is:
a) 1 b) 2 c) 3 d) 4
6. A covalent non-polar bond is formed between:
a) atoms of one nonmetal b) atoms of different nonmetals
c) active metals and nonmetals d) between metal atoms
7. The essence of ionic bonding is:
a) in the electrostatic attraction between opposite charges (ions)
b) formation of common electron pairs
c) electrostatic attraction between positive ions and electrons. electrons
d) attraction between molecules.
8. Electronegativity of chemical elements in periods with increasing
order number of the element:
a) increases b) decreases
c) first increases, then decreases d) does not change
9. Correct statements include:
a) by joining together, atoms tend to reach a stable
stable state
b) the cause of inertness of helium and neon is the gaseous state
c) covalent bonding occurs between atoms of active metals and
nonmetals
d) ionic bonding is formed between potassium and chlorine
10. In the period from left to right, the atomic radius and metallic properties
respectively:
a) increases and increases b) decreases and increases
c) increases and decreases d) decreases and decreases
11. An outer level is considered complete (except hydrogen and helium) if at
it:
a) 2 electrons b) 1 electron c) 7 electrons d) 8 electrons
12. the formation of a hydrogen molecule from atoms, can be depicted:
a) H + H → H – H b) H + – H → H — H
c) H – + H → H – H d) H – + – H → H — H
13. Which molecule has a triple bond?
a) N2 b) Cl2 c) O2 d) H2
14. Select an element with a variable valence:
a) Cl b) K c) Al d) Na
15. When a covalent polar bond is formed, the electron pair is:
a) shifted to the left b) shifted to the right
c) is equipotent between all atoms
d) shifted to the more electronegative element
16. In which compound is the valence of iron equal to III?
a) Fe3O4 b) FeO c) Fe2O3 d) FeO3
17. A covalent polar bond is formed between:
a) between different metal atoms
b) between equal atoms of nonmetals
c) between different atoms of nonmetals
d) between metal and nonmetal atoms.
18. Write the electron and electron-graphic formulas for the Ca atom.
State the valence of the element.
19. Write down the electronic and graphical diagrams of the formation of the HCl molecule.
20. In the series of elements: Al Si P S:
a) the number of electron layers in atoms increases;
b) non-metallic properties increase;
c) the number of outer electrons in atoms decreases;
d) the radii of atoms increase.
Option 2
1. Type of chemical bonding in a molecule of nitrogen (N2):
a) covalent nonpolar b) ionic
c) covalent polar d) metallic
2. The most electronegative chemical element:
a) C b) P c) H d) Cl
3. The charge of the aluminum ion is:
a) 2+ b) 3+ c) 2- d) 3-
4. The incomplete outer electron layer has an atom of the chemical
element:
a) Not b) Na c) Ar d) Ca
5. The number of electrons in the outer electron layer belonging to only
atom of oxygen in an O2 molecule is equal to:
a) 1 b) 2 c) 4 d) 6
6. An ionic bond is formed between:
a) atoms of one nonmetal b) atoms of different nonmetals
c) active metals and nonmetals d) atoms of one metal
7. The essence of covalent polar bonding is:
a) in the electrostatic attraction between opposite charges
(ions)
b) in the formation of common electron pairs
c) in the electrostatic attraction between positive ions and
electrons
d) attraction between molecules.
8. In the group of halogens (VII A) the electronegativity with increasing order number of the elements:
a) increases b) decreases
c) first increases, then decreases d) does not change
9. The following judgments cannot be classified as correct:
a) completed electron layers in noble gas atoms
b) the formation of a chemical bond leads to a decrease in the potential
energy of formation of a molecule
c) ionic bonding occurs between active metals and nonmetals
d) in periods with increasing ordinal number electronegativity
decreases
10. Metal atoms, when forming an ionic bond:
a) give up electrons b) accept electrons
c) double the number of electrons d) do not change
11. In groups A, from top to bottom, the nucleus charge and metallic properties
respectively:
a) increases and increases b) decreases and decreases
c) increases and decreases d) decreases and increases
12. As a result of the formation of a covalent bond, electrons are united:
a) paired electrons b) unpaired electrons
c) ions and unpaired electrons d) various ions
13. Choose a molecule with covalent non-polar bonding:
a) P2O5 b) CO2 c) F2 d) CS2
14. Choose a pair in which the first element is more electronegative than the second:
a) C and Cl b) F and O c) P and O d) Si and S
15. Select an element with a constant valence:
a) C b) N c) Ve d) Fe
16. Choose a molecule with covalent polar bonding:
a) N2 b) P4 c) H2 d) CO2
17. Identify the name of the chemical element from the electron diagram of the atom:
2ē, 8ē, 5ē
18. Write the electron and electron-graphic formulas for As atom.
State the valence of element.
19. Write down the electronic and graphical diagrams of the formation of H2S molecule.
20. In the series of chemical elements Na – Mg – Al:
a) the charge of the nuclei of the atoms decreases;
b) the number of electrons in the outer energy level increases;
c) the radius of atoms decreases;
d) electronegativity decreases; metallic
properties of
| Option 1 | Option 2 | |
| 1 | C | А |
| 2 | B | D |
| 3 | А | B |
| 4 | А | B |
| 5 | C | D |
| 6 | А | B |
| 7 | А | B |
| 8 | C | B |
| 9 | А,C,D | D |
| 10 | D | А |
| 11 | D | А |
| 12 | D | B |
| 13 | А | C |
| 14 | А | B |
| 15 | D | C |
| 16 | C | D |
| 17 | C | Р (phosphorus) |
| 18 | ||
| 19 | ||
| 20 | B | BC |
