Atomic Structure

For which one of the following sets of four quantum numbers, an electron will have the highest energy?

With reference to atomicity, Argon is _____.

How many oxygen atoms are present in a molecule of potassium permanganate?

Halogens have _____ electrons in their outermost shells.

Which one of the following processes involves chemical reactions?

A substance which brings a chemical change about substance is called 

Aluminium window frames do not corrode away because the aluminium is: 

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements are true regarding this compound?

 $1.$ Molecular formula of Z is $X{Y}_2$

$2.$ It is soluble in water.

$3.$ X and Y are joined by sharing of electrons.

$4.$ It would conduct electricity in the molten state.

Codes:

When chlorine gas is passed through an aqueous solution ofKBr, the solution turns orange brown due to the formation of

When the neutral X atom is compared to the ion of another element Y, which of the following could be the same?

(i) Proton numbers

(ii) Electron numbers

(iii) Neutron numbers

(iv) Chemical properties

X and Y atoms are atoms of the same element. Which of the following is equal in X and Y?

(i) Proton numbers

(ii) Neutron numbers

(iii) Mass numbers

Which of the following matching is correct?
    Subatomic particle                                Scientist

1. Electron                                          (i) Crooks, Thomson

2. Proton                                            (ii) Goldstein

3. Neutron                                         (iii) Chadwick

$x{\mathrm{FeS}}_2+y{\mathrm{O}}_2\to {\mathrm{wFe}}_2{\mathrm{O}}_3+{\mathrm{SO}}_2$

Identify $x,y,\; and z$ in the above chemical equation

Which one of the following processes involves chemical reactions?

Match the items of Column 1 and Column 2.

          Column 1                                                                                                                   Column 2 

1. Atom with two neutrons, one proton, and one electron                                         (1) Mass number

2. Sum of protons and neutrons in an atom                                                              (2) Neutron

3. Atoms with different nuclear charges but the same number of (p+n)                           (3) Tritium

4. Subatomic particle which is as massive as a proton but neutral                             (4) Isotones

Dealing with X, Y and Z particles

• X has more protons than electrons
• The physical properties of Y and Z are different; their chemical properties are the same.   

Which of the following statements are correct?

(1) X is cation

(2) Y and Z belong to the same element 

(3) Y and Z have different neutron numbers

Regarding the X, Y and Z particles above, 

(1) X is neutral, Y is cation, Z is anion

(2) X and Y belongs to the same element, Z to a different element

(3) X and Y are isotopes of each other, Y and Z are isoelectronic with each other.

Which of statements are correct?

In ⁸⁰X^2- ion, the number of neutrons is 10 times more than the number of electrons. What is the number of protons in the element X?

An atom with four protons and four neutrons will have a valency of: