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Which of the following statements regarding group 16 elements is not true? 2s22p4 b) The electronic configuration of Sulphur is 3s23p4 c) The atomic radii of the elements of group 16 are larger than those of the corresponding elements of group 15 d) The electronic configuration of Tellurium is 4d105s25p4

Correct Answer: He
When you move across the periodic table, from left to right, the atomic size of the respective elements decreases due to increase in nuclear charge. Therefore, the atomic radii of the elements of group 16 are smaller than those of the corresponding elements of group 15.

Which of the following statements is/are false regarding modern periodic table?
1. Elements in the modern periodic table are arranged in decreasing order of their atomic numbers.
2. Elements in the modern periodic table are arranged in increasing order of their atomic masses.
3. In the modern periodic table, isotopes are placed in adjacent groups.
4. Elements in modern periodic table are arranged in increasing order of their atomic numbers.

From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.

Consider the following statements.
1. A chalcogenide glass is a glass containing sulphur, selenium or tellurium.
2. Chalcogenide glass form the basis of re-writable CD and DVD solid-state memory technology.
Which of the statement(s) given above is/are correct?

The radiation absorbed by elements of low atomic number is lower than that absorbed by elements of high atomic number. This variation of absorption co-efficient with atomic number can be very well applied to

In Mendeleev's periodic table, iodine with lower atomic weight than that of tellurium was placed alongwith

Which of the following statements are true? Statement 1: Electronic configuration of sodium is 1s22s22p63s1. Statement 2: Electronic configuration of sodium ion is 1s22s22p6.

When the elements are arranged in increasing order of atomic weights, the atomic weight of the middle element is approximately the average of the atomic weights of the other two elements' - this rule is known as-

Consider the following statements with reference to the periodic table of chemical elements.
1. Ionization potential gradually decreases along a period.
2. In a group of elements, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decreases as the atomic number increases.
Which of these statement(s) is/are correct?

In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as
Atomic and Molecular Physics mcq question image

L is older than M and taller than N. O is younger than P, older than N and shorter than Q. R is older than S, younger than N, shorter than S and taller than Q. S is older than L, M, O, P, Q, R and S is necessarily false?