Elements in group VIA (6A) of the periodic table: form ions with 3-charge form i

ID: 994462 • Letter: E

Question

Elements in group VIA (6A) of the periodic table: form ions with 3-charge form ions with 2 + charge form ions with 1+ charge form ions with 2- change In general electro negativity (E_0) values (ability of an atom of an element to attract electrons I a chemical bond: decreases from left to right in a period increases from left to right in a period increase from top to bottom in a group increases from right to left in a period What is the formula of bicarbonate ion? HCO^-_3 CO^2-_3 CO^3-_2 HCO^2- Section B: Predict the chemical formula formed between metals and nonmetals and polyatomic ion. Fill in each column. Write the full electron configurations of element P (atomic nol 5) Write shorthand electron configurations of element of element Ni atomic no 28

Explanation / Answer

11. The general outermost electronic configuration of elements of VI A is ns2np4.

So. They form ions with charge 2- as they gain 2 electron to complete their octet.

12. In general, the electronegativity increases from left to right in a period.

Reason: on moving across the period left to right, the size of elements decreases and effective nuclear charge increases due to which the tendency to attract shared pair of electrons in a bond increases.

13. The formula of bicarbonate ion i.e. hydrogen carbonate is HCO3-.

Section B

Elements

Symbol of their ions

Chemical formula

Name of ionic compound

K and S

K+(group I element)

S2- (group VI element)

K2S

Potassium sulphide

Ba and nitrate

Ba2+(group II element)

NO3-

Ba(NO3)2

Barium nitrate

2a. As the atomic no. of P is 15, so it has 15 electrons

Using Bohr-Burry Rule, the electronic configuration is 2,8,5.

Using Aufbau’s principle, it would be 1s22s22p63s23p3.

2b. The preceding noble gas of Ni is Argon(20).

So, the shorthand electronic configuration of Ni (28) : [Ar]4s23d8