21st Century Chemistry Multiple Choice Question in Topic 2 The Microscopic World
The elements in the periodic table are arranged according to A atomic
Elements in the same period of the periodic table A
have the same number of occupied electron shells.
Elements X and Y are in the same period of the periodic table. Which of the following statements concerning X and Y is correct? A
They have the same number of occupied electron shells in their atoms.
They have the same number of outermost shell electrons in their atoms.
Which of the following elements belongs to the same group of the periodic table as sodium? A Helium B Lithium C Magnesium D Aluminium
Which of the following elements is a transition metal? A Calcium B Phosphorus C Copper D Aluminium
Which of the following represents the electronic arrangement of an atom of a non-metal? A 2,8,1 B 2,8,3 C 2,8,6 D 2,8,8,2
To which group does the atom 28 Si belong?
Which of the following pairs of atomic numbers corresponds to a pair of metals? A 4,
Which of the following combinations of elements belongs to the same group in the periodic table? A
10. In the periodic table, the most reactive metals are in
11. Which of the following pairs of atomic numbers correspond(s) to a pair of non-metals?
12. Which of the following statements concerning the periodic table are correct?
(1) Across the period, from left to right, the number of outermost shell electrons increases. (2) Elements in the same group have different number of occupied electron shells. (3) The elements in the same period have similar physical properties. A
13. An element has 10 protons and 9 neutrons. Which of the following statements is/are
INCORRECT? (1) The element is a noble gas. (2) The element is in Period 4. (3) The mass number of the element is 19. A (1)
14. Across a period of the periodic table, from left to right,
(1) the melting points of elements increases. (2) the atomic numbers of elements increases. (3) the number of occupied electrons shells remains the same. A
15. Elements in the same group of the periodic table
have the same number of electron shells.
16. The chemical properties of an element depend on
the number of occupied electron shells in its atoms.
the number of outermost shell electrons in its atoms.
17. The atomic number of an element X is 15. The atomic number of an element with similar
chemical properties to those of X is A 5. B 7. C 23. D 25.
18. Which of the following pairs of atomic numbers corresponds to elements with similar chemical
Element Atomic
Which of the above elements is the most reactive metal? A W B X C Y D Z
Atomic number Number of neutrons
Which of the following statements is INCORRECT? A
Y and Z have similar chemical properties but different physical properties.
21. Which of the following statements concerning halogens is INCORRECT?
They all have seven outermost shell electrons.
All halogens exist as diatomic molecules.
Melting points of halogens increase down the group.
22. Chlorine and bromine have similar chemical properties because
they have the same number of outermost shell electrons.
they have the same number of occupied electron shells.
they have the same electronic arrangement.
23. Which of the following statements concerning noble gases is INCORRECT?
They occupy only small percentage in atmosphere.
They have completely filled outermost shells.
24. Argon is used to fill light bulbs because it
25. Which of the following pairs of atomic numbers represent(s) elements with similar chemical
properties? (1) 7 and 16 (2) 10 and 18 (3) 12 and 20 A (1)
26. Which of the following statements concerning the elements in the same group of the periodic
table is/are correct? (1) They have the same number of outermost shell electrons. (2) They have same chemical properties. (3) They exist in the same physical state at room temperature and pressure. A (1)
27. Which of the following statements concerning calcium are correct?
(1) It is less reactive than potassium. (2) It can react with water. (3) It belongs to the third period of the periodic table. A
28. Which of the following statements concerning the elements in the same group of the periodic
table are correct? (1) The atomic size increases down the group. (2) The reactivity of elements increase down the group. (3) The number of electron shells increases. A
29. Which of the following statements concerning alkali metals are correct?
(1) The density of all alkali metals are lower than that of water. (2) The element with the greatest relative atomic mass is the most reactive. (3) All of them react with water to give an alkaline solution. A
30. Which of the following statements concerning noble gases is/are correct?
(1) All noble gases have 8 outermost shell electrons. (2) Their atomic masses increase down the group. (3) Some noble gases are coloured. A (1)
31. There is a gradual change in the properties of alkali metals from lithium to potassium. Which of
the following properties is/are in the order: Lithium < Sodium < Potassium? (1) Density (2) Reactivity (3) Melting
32. Which of the following statements concerning halogens are correct?
(1) All halogens are coloured. (2) All halogens are toxic. (3) The reactivity of halogens increases down the group. A
33. Which of the following statements concerning the periodic table are INCORRECT?
(1) Alkali metals are Group II elements. (2) Across the period, from left to right, the elements change from non-metals to metals. (3) Elements in the same group have similar physical properties. A
34. Which of the following statements concerning noble gases are correct?
(1) All noble gases are unreactive. (2) Their atomic numbers increase down the group. (3) They have low melting and boiling points. A
35. Helium is used to fill airship because it
(3) has high percentage by volume in air. A
36. Which of the following statements concerning argon are correct?
(1) Argon exists as monoatomic molecules. (2) The outermost electron shell of an argon atom has an octet structure. (3) Argon is used to fill light bulbs. A
37. A solid element X has a melting point below
100 oC. It is stored in paraffin oil in the laboratory. X is likely to be a A
38. Rubidium is below potassium in the periodic table. Which of the following statements
It reacts vigorously with water to give hydrogen.
39. Strontium is below calcium in the periodic table. Which of the following statements concerning
strontium are correct? (1) Strontium is an alkaline earth metal. (2) It reacts with dilute hydrochloric acid to give hydrogen. (3) It reacts with non-metals to form salts. A
40. Strontium is below calcium in the periodic table. Which of the following statements concerning
strontium is INCORRECT? (1) It has 2 outermost shell electrons. (2) It reacts with water to give an alkaline solution. (3) It is a non-metal. A (1)
41. The electronic arrangement of barium is 2,8,18,18,8,2. Which of the following statements
concerning barium are correct? (1) It is more reactive than calcium. (2) It reacts with non-metals to give salts. (3) It reacts with water readily. A
42. Rubidium belongs to the group of alkali metals. Which of the following statements concerning
rubidium are correct? (1) It reacts with chlorine to form a crystalline solid. (2) It reacts vigorously with water. (3) All of its compounds are coloured. A
43. Astatine is below iodine in the periodic table. Which of the following statements concerning
astatine are correct? (1) It has a dark colour. (2) It is a gas. (3) It is less reactive than iodine. A
September 2012- Version n°22 ANRS - AC 11 : RESISTANCE GROUP GENOTYPE INTERPRETATION: NUCLEOSIDE AND NUCLEOTIDE REVERSE TRANSCRIPTASE INHIBITORS Mutations associated with resistance Mutations associated with « possible resistance » T215Y/F T215A/C/D/E/G/H/I/L/N/S/V [1, 2, 3, 4] At least 3 mutations among : M41L, D67N, K70R, L210W, T215A/C/D/E/G/H/I/L
HIV and Heart HealtH It’s no secret that both HIV and antiretroviral treatment can cause problems that can increase the risk of cardiovascular disease, including heart attacks and strokes. However, QUICK TIPS there are many ways to protect your heart if you’re HIV positive, including selecting antiretrovirals carefully, monitoring your lipid levels, and doing your best to control