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Radon is the sixth member of group 18 of the modern periodic table. Unlike other members of this group, Radon:

Radon is the sixth member of group 18 of the modern periodic table. Unlike other members of this group, Radon: Correct Answer is radioactive

Radon is a radioactive noble-gas at room temperatures. It is one of densest gases and the only naturally occurring radioactive gas. However, its daughter nuclei are solids. Not many compounds of Radon are known.

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Radon 222 এবং Radon-220 উভয়ই Radon এর আইসোটোপ। যদি Radon-222 এর নিউক্লিয়াসে 136 টি নিউট্রন থাকে তাহলে Radon-220 এর নিউক্লিয়াসে কতগুলো প্রোটন থাকবে? ( Radon-222 and Radon-220 are the isotopes of Radon. If Radon-222 has 136 neutrons then what will be the number of protons in the nucleus of Radon-220?)
Which of the following statement(s) is/are false regarding the modern periodic table? i. In the modern periodic table, the elements are arranged in decreasing order of their atomic numbers. ii. In the modern periodic table, the elements are arranged in increasing order of their atomic masses. iii. In the modern periodic table, isotopes are placed in adjacent groups. iv. In the modern periodic table, the elements are arranged in increasing order of their atomic numbers.
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.
The average age of a family having three members is 40 years. The smallest member of the family is 18 years old. The difference between the age of the oldest family member and the age of the second oldest family member is 6 more than the difference between the age of the second oldest member and age of youngest member of the family. Quantity I: 25 years hence, what will be the average of the age of smallest member and that of oldest member of the family? Quantity II: What is the age of the oldest member of the family?   
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Which element was assigned Group III A in the Mendeleev's periodic table but is a member of Group-13 in the modern periodic table?
When they had a meeting seven company executives __ T, U, V, W, X, Y and Z ___ sit at a rectangular table .Three executives sit along one side of the table , and three sit along the other side, each directly opposite one of the other three. The seventh sits at the head of the table . There is no seat at the foot of the table . Ualways sits in one of te two seats farthest from the head of the table. Y and V always sit next to each other .V never sits next to Z . If Z does not sit at the head of the table, W sits there. If W sits directly opposite T, X must sit next to which of the following excutives?
In a family of four members, the average age of the first three members is twice that of the fourth member. The average of the four members is 35 years. If the age of the fourth member is less than from only 2 members in the family, then what is the possible age of the youngest member?
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