The maximum number of electron capacity of principal energy level (shell) n=2 is

Question

The maximum number of electron capacity of principal energy level (shell) n=2 is 32 18 8 12 Which one of the following compound is ionic? NH_3 Na_2 O N_2 O_4 NO_2 Which pair of dement, has,the same number of valence electron.? Aland Cl P and Ne P and N Mg and Na Total maximum number of electron capacity of subshell d is 10 6 14 8 Which one of the following compound is ionic? NH_3 NO_2 N_2 O_4 Na_2 O Which of the following polyatomic ions have a positive charge? hydroxide cyanide nitrate ammonium Formula of sulfate ion is: SO_3^3- SO_4^2- SO_4^3- S^2- Which compound has a polyatomic ion in the formula? KOH K_2 O K_2 S KCI Which of the following set of elements is arranged from largest to smallest atomic size? (decreasing atomic radius in a period or a group)? Na, Cl, P Br, Cl, F Li, Na. K, none of these Which of the following atom is most electronegative? F Br Cl I What is the molecular shape of H_2S? linear trigonal planar tetrahedral angular

Explanation / Answer

Question 1: Answer (C)

Explanation: Formula for calculation of maximum number of electron in nth shell= 2 (n2)

=2 (22)

=2X4 = 8

Question 2: Answer (B)

Explanation: an ionic compound is a chemical compound comprising ions held together by electrostatic forces termed ionic bonding.

Question 3: Answer (C)

Explanation: same group elements in the periodic table having same number of valence electrons

Therefore, N and P having same group elements so option is (C).

Question 3: Answer (A)

D subshell having maximum number of electron capacity is 10 only

S subshell = 2 electrons

P subshell = 6 electrons

D subshell = 10 electrons

Therefore, Answer (A)

Question 4: Answer (D)

Explanation: an ionic compound is a chemical compound comprising ions held together by electrostatic forces termed ionic bonding.

Therefore Na2O having ions held together by electrostatic forces termed ionic bonding.

Question 5: Answer (D)

Polyatomic ion is a molecular ion, is a charged chemical species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit.

Based on the above definition Poly atomic ion having positive charge is NH4+.

Question 6: Answer (B)

Explanation: Sulfate ion is a polyatomic anion with the empirical formula SO4-2.

Question 7: Answer (C)

Question 8: Answer (B)

Explanation: In a group from top to bottom in the periodic table atomic size increases

Out of the options given fluorine to Bromine atomic size increases. The increasing order of atomic sizes as follows. Br>Cl>F

Question 9: Answer (A)

Fluorine is the most electronegative element in the periodic table. The electro negativity value is 3.98.

Question 10: Answer (D)

Lewis structure of H2S having two lone pairs of electrons nestled on the sulphuur atom. These electrons crowd the bonding pairs of electrons and prevent them from being oriented in a straight line. The resulting molecule is V-shaped (or bent, or angular). If the lone pairs of electrons did not exist, then we would expect H2S to be linear rather than bent. For an example of how dramatically the presence of lone pairs can affect a molecule's geometry, compare the geometry of H2S to that of BeH2, a molecule that lacks lone pairs on its central atom

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