What sublevel is filled after 4S

What is the electronic formula of Al

Specify the maximum number of electrons on p-orbital

How many power levels has the atom with a serial number 8

Number of the electrons on the outer energy p-sublevel of atom of chlorine is equal to

Specify the maximum amount of electrons at the first energy level

Specify the number of neutrons for an atom of potassium

Specify the number of electrons of oxygen atom

Specify the number of electrons in atom of aluminum

Specify, what sublevel is filled after 4s

Characteristic of covalence bond

Electronegativity is an ability of atom...

A) to attract electrons

A) Polarizability

B) Length of bond

А) 3d

А) 13

241. What of metals refers to d - elements?

А) Fe

А) 8

243. What formula reflects the total number of electrons in energy level?

А) N=2n²

244. Name the element that has an electronic formula...3s²3p³

А) P

245. In what group are alkaline metals in D.I.Mendeleyev table located?

А) I A

246. In what groupis alkaline earth metals are locatedin the table of D.I.Mendeleyev?

А) II A

247. In what group are halogens in D.I.Mendeleyev's table located?

А) VI A

А) 20

249. What electronic formula corresponds to atom of oxygen?

А) 1S²2S²2p⁴

А) 2

А) 5

А) 3

А) 6

254. How many elements in the fourth period of periodic system?

A) 18

255. What the line of elements is presented in increasing order of nuclear radius?

A) О, S, Se, Те

256. How many of energy orbitals exist for chemical elements?

B) 4

А) 1S²2S²2p⁶3S²3p¹

А) 3d

259. What sublevel is filled in atoms after the sublevel 5s?

А) 4d

260. The electronic formula of atom is 1S²2S²2p⁶3S²3p⁶4S²3d⁶. What element is it?

А) Fe

261. What maximum number of electrons could the atom contain in an electronic level n=4

А) 32

262. Indicate the simple substances: O₂, , , , С₂Н₂, Н₂O₂, H₂S, H₂SO₄, NaCI

A)

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