Fill in the blanks. a) The periodic law states that the chemical properties of t

Question

Fill in the blanks. a) The periodic law states that the chemical properties of the elements vary repetitively with. b) The periodic table is a list of the elements, in order of increasing, done in such a way the elements with similar are grouped together. c) Se is in the block. d) The outermost level of Ag is level. e) Eu is in the block. f) Ba is in the block. g) The outermost level of I is level. h) The last electron in the electron configuration of P is in the sublevel. i) The last electron in the electron configuration of Hg is in the sublevel. j) The last electron in the electron configuration of Gd is in the sublevel. k) The last electron in the electron configuration of Ba is in the sublevel.

Explanation / Answer

a)

The Periodic Law states that the chemical properties of the elements vary repetitively with increasing atomic number

b) The periodic table is list of elements in order of increasing ionization energy done in such way the element with similar chemical properties are grouped together.

Explanation- Since the first ionization energy changes periodically, chemical and physical properties of substances also change periodically.

c) Se is in p block (Selenium Electron configuration [Ar] 3d104s24p4 is p block element.)

d) The outermost level of Ag is level 5

Explanation - Atomic Number of Ag is 47. It has 5 Energy Levels .First Energy Level: 2, Second Energy Level: 8, Third Energy Level: 18, Fourth Energy Level: 18 and Fifth Energy Level: 1

e) Eu is in the block f (Electron configuration [Xe] 4f76s2 is f block element.)

f) Ba is in the s block   (Electron configuration [Xe] 6s2 is block s element)

g) The outermost level of I is level 5(Atomc number 57=1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 4p6, 4p10, 5s2, 5p5)

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