Test tasks

 
1. Smallest particle of an element which can take part in any chemical change.
A. Atom
B. Nucleus
C. Proton
D. Neutron
E. Electron
2. Protons (p+) and neutrons (n0) constitute the …
A. Nucleus
B. Orbital
C. Diameter
D. Nucleon
E. All of above
3. Neutrons (n0) a neutral and carry
A. Positive charge
B. Negative charge
C. No charge
D. No right answer
4. The p-elements of IVa group are carbon, silicon, germanium, tin and lead. Nonmetallic
properties down the group tend to:
A. Increase
B. Decrease
C. No change
D. From C to Ge increase but from Sn to Pb decrease
E. From C to Ge decrease but from Sn to Pb increase
5. Most composition of sun is mainly
A. Hydrogen and oxygen
B. Hydrogen and helium
C. Helium and cesium
D. Helium and oxygen
E. Cesium and hydrogen
6. The blue vitriol CuSO4•5H2O is used in medicine as bactericidal agent. Define the electronic configuration of copper:
A. 3d104s1
B. 3d94s2
C. 3d64s2
D. 3d84s2
E. 3d74s2
7. A … is a combination of two or more atoms that are held together by covalent bonds.
A. Moles
B. Molecules
C. Ions
D. Electrons
E. Megatrons
8. The modern periodic table is organized by … atomic number.
A. Increasing
B. Reducing
C. Decreasing
D. Developing
E. Oxidizing
9. An element is determined by the number of … . Also known as its atomic number.
A. Neutrons
B. Wontons
C. Electrons
D. Protons
E. Nucleus
10. Identify the compound below which is a molecular compound:
A. NaCl
B. SO3
C. Na2CO3
D. KOH
E. CaF2
11. Low toxic nitrogen oxide named “laughing gas” is used in medicine for anaesthetization. Define this compound from the following:
A. NO
B. NO2
C. N2O
D. N2O3
E. N2O5
12. Which of the following is a monatomic gas at STP?
A. Fluorine
B. Nitrogen
C. Chlorine
D. Helium
E. Sodium
13. The atomic mass of an element is
A. The average mass of all the isotopes of the element.
B. A measure of the density of that element.
C. The mass of the most common isotope of that element.
D. The number of protons and electrons in the atoms of the element.
14. A positively charged particle with mass 1.673∙10-22 g is …
A. A proton
B. An electron
C. A neutron
D. An isotope
E. A nucleus
15. The nucleus of most atoms is composed is
A. Tightly packed protons and neutrons
B. Tightly packed protons
C. Tightly packed neutrons
D. Loosely connected protons and electrons
E. Double that of a protons
16. One of the classifications of the chemical elements is based on their electronic configuration. According to it all elements are divided into s-, p-, d- and f-elements. Choose p-elements:
A. S, P, Cl;
B. K, Ca, Se;
C. Ba, Mg, Al;
D. Mn, Br, Mo;
E. P, S, Cr.
17. Zn-66 has (atomic number 30).
A. 30 neutrons
B. 36 neutrons
C. 33 neutrons
D. 96 neutrons
E. 66 neutrons
18. Neon-22 contains 12 neutrons. It also contains
A. 12 protons
B. 22 protons
C. 12 electrons
D. 10 electrons
E. 10 protons
19. What is the electron configuration for aluminum , atomic number 13
A. 1s22s22p33s23p33d1
B. 1s22s22p63s22d1
C. 1s22s22p63s23p1
D. 1s22s22p9
E. 1s22s22p33s23p33d3
20. Each electron has a … electrical charge.
A. Neutral
B. Positive
C. Negative
D. Shocking
E. All of above
21. Each neutron has an electrically … charge.
A. Neutral
B. Positive
C. Negative
D. Shocking
E. All of above
22. An element is composed of …
A. Atoms
B. Molecules
C. Compounds
D. Chemical reaction
23. A single proton has what electrical charge?
A. No charge
B. Negative charge
C. Either a positive or negative charge
D. Positive charge
E. Neutral charge
24. Mass number refers to:
A. The number of protons in the nucleus of an atoms
B. The total number of protons and neutrons in the nucleus of an atom
C. The number of neutrons in an atom
D. The number of electrons in an atom
E. All of above
25. The electron configuration :2,8,8,2 is that of:
A. Silicon
B. Chromium
C. Calcium
D. Potassium
E. Sulfur
26. The electron configuration for Al3+ is …
A. 2,8,3
B. 2,8,6
C. 2,8,2
D. 2,8
E. 2,7
27. An element , X , has the following electron configuration : 2 , 5
The atomic number of element X would be:
A. 5
B. 7
C. 3
D. 6
E. 8
28. The number of valence electrons in the Group2 elements of the Periodic Table is
A. 2
B. 4
C. 6
D. 8
E. 3
29. If an element has the electron configuration: 2, 8, 2 then it would most likely form an ion charge.
A. +6
B. -6
C. +5
D. -5
E. +2
30. Atoms of the same element which have the same number of protons but a different number of neutrons are known as.
A. Ions
B. Isotopes
C. Neutral atoms
D. A chemical family
E. All of above