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The relative atomic mass of naturally occurring lithium consisting of 90% 7Li and 10% 6Li is
6.2
6.9
6.8
7.1
Which of the following statements about the periodic table is correct?
Elements in the same period have the same number of valence electrons
Elements in the same group have the same number of electron shells
The non‑metallic properties of the elements tend to decrease across each period
The number of valence electrons increases progressively across a period
From the diagram above an ideal gas can be represented by
L
K
N
M
The principle of column chromatography is based on the ability of the constituents to
react with the solvent in the column
move at different speeds in the column
react with each other in the column
dissolve in each other in the column
Which of the following properties is NOT peculiar to matter?
Kinetic energy of particles increases from solid to gas
Random motion of particles increases from liquid to gas
Random motion of particles increases from gas to solid
Orderliness of particles increases from gas to liquid
