Which statements describe changes that occur from left to right across a period of the Periodic Table? 1 The atomic number of the elements increases. 2 The metallic character of the elements decreases. 3 The physical state of the elements changes from gas to solid.
A.
2 only
B.
1 and 2
C.
1 and 3
D.
2 and 3
Exam No：0620_s24_qp_12 Year：2024 Question No：23
Answer:
B
Knowledge points:
8.3.1.1. increasing density
8.3.1.2. decreasing reactivity
8.3.2.1. chlorine, a pale yellow-green gas
8.3.2.2. bromine, a red-brown liquid
8.3.2.3. iodine, a grey-black solid
8.3.3. Describe and explain the displacement reactions of halogens with other halide ions
8.3.4. Predict the properties of other elements in Group VII, given information about the elements
Solution:
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