Periodic Table and Periodic Properties

Chemistry · 11th Class (Intermediate Part 1) · BISE Lahore

70 questions

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20 questions · Periodic Table and Periodic Properties × 1, Atomic Structure × 1, Chemical Bonding × 2, Stoichiometry × 1, States and Phases of Matter × 1, Chemical Energetics × 2, Reaction Kinetics × 1, Chemical Equilibrium × 1, Acid-Base Chemistry × 1, Electrochemistry × 2, Hydrocarbons × 2, Nitrogen and Sulfur × 1, Halogens × 1, Atmosphere × 1, Basic Separation Techniques × 1, Lab Safety and Practical Skills × 1

Periodic Table and Periodic Properties Test

10 questions · Periodic Table and Periodic Properties × 10

Sample questions

Showing 10 of 70 questions from this chapter. The full bank is in the chapter test below.

1
The older name "inert gases" was replaced by "noble gases" because ...
- A.some noble gases do form compounds, such as $\ce{XePtF6}$ (correct answer)
- B.noble gases were found to be radioactive in nature
- C.noble gases occur in the atmosphere only as mixtures
- D.noble gases were found to show variable oxidation states
Why: Although the noble gases are unreactive under normal conditions, xenon forms compounds such as xenon hexafluoroplatinate ( $\ce{XePtF6}$ ), so the term inert gases was changed to noble gases.
2
In 1829 Dobereiner grouped elements into triads. Which set of elements forms such a triad?
- A.Beryllium, magnesium and calcium
- B.Oxygen, sulfur and selenium
- C.Lithium, sodium and potassium (correct answer)
- D.Helium, neon and argon
Why: Dobereiner's triad of Li (7), Na (23) and K (39) showed that the atomic weight of the middle element, sodium, is roughly the average of the other two.
3
John Newlands arranged the 62 known elements in order of increasing atomic mass and observed that the properties of an element were repeated after every ... element.
- A.Third
- B.Eighth (correct answer)
- C.Ninth
- D.Twelfth
Why: Newlands noticed in 1864 that every eighth element resembled the first one in properties, which was the first clear recognition of periodicity.
4
Which chemist arranged the elements in order of increasing atomic mass in 1869 and left gaps for elements that had not yet been discovered?
- A.John Newlands
- B.Henry Moseley
- C.Dmitri Mendeleev (correct answer)
- D.Antoine Lavoisier
Why: Mendeleev, regarded as the father of the periodic table, arranged 63 elements by atomic mass and his predicted properties for the missing elements were later confirmed.
5
Moseley determined the exact atomic numbers of the elements by studying X-ray emission. As a result, the Periodic Law now states that the properties of elements are periodic functions of their ...
- A.Atomic masses
- B.Atomic numbers (correct answer)
- C.Atomic volumes
- D.Atomic radii
Why: Moseley showed that atomic number, not atomic mass, is the fundamental property that governs periodicity, which removed the discrepancies in Mendeleev's table.
6
How many periods and groups are present in the modern periodic table?
- A.Seven periods and eighteen groups (correct answer)
- B.Eight periods and eighteen groups
- C.Seven periods and sixteen groups
- D.Nine periods and eighteen groups
Why: The 118 known elements are arranged in seven horizontal rows called periods and eighteen vertical columns called groups.
7
Which family consists of the most reactive metals, each of which has a single valence electron?
- A.Alkaline earth metals
- B.Transition metals
- C.Alkali metals (correct answer)
- D.Chalcogens
Why: Group 1 elements (Li, Na, K, Rb, Cs, Fr) have one valence electron and react with water to produce alkalis, which makes them the most reactive metals.
8
Elements of the same group of the periodic table show similar chemical properties mainly because they have the same ...
- A.Number of electron shells
- B.Number of valence electrons (correct answer)
- C.Atomic mass
- D.Number of neutrons
Why: Chemical behaviour within a group is governed by an identical number of valence electrons, while the physical properties change gradually from top to bottom.
9
The name chalcogen given to the group 16 elements comes from the fact that ...
- A.these elements form salts with alkali metals
- B.these elements dissolve in water to give alkalis
- C.these elements are found mainly in the earth's crust
- D.most ores of copper occur as their oxides or sulfides (correct answer)
Why: Chalkos is Greek for copper, and most copper ores are oxides or sulfides of group 16 elements such as oxygen and sulfur.
10
The halogens are called salt-formers because they ...
- A.dissolve in water to give alkaline solutions
- B.possess the lowest electron affinities among nonmetals
- C.react readily with alkali metals to form salts (correct answer)
- D.exist as diatomic gases at room temperature
Why: Halogens react easily with group 1 and group 2 metals to form salts. They are highly reactive nonmetals with high electron affinities, so option B states the opposite of the truth.

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