Which year did the U.N. General Assembly declare as the International Year of the Periodic Table?

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U.N. ജനറൽ അസംബ്ലി, ഇൻറ്റർനാഷണൽ ഇയർ ഓഫ് പീരിയോഡിക് ടേബിൾ (International Year of Periodic Table) ആയി പ്രഖ്യാപിച്ച വർഷം ഏത്?

A2021

B2020

C2019

D2018

Answer:

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Th electronic configurationof an element x is:1S²2S²2P⁶3S²3P⁶3d³4S²

^{x belongs to:}

Match the items in Column X with those in Column Y.

X	Y
1.Alkali metals	K. Decreases across a period
2.Moseley	L. Variable oxidation states
3.lonization enthalpy	M. Strong oxidizing agent
4.Transition metals	N. Periodic law based on atomic mass
5.Chlorine	O. Good reducing agents
	P .Partially filled valence shell
	Q. Increases across a period
	R. Periodic law based on atomic number