Download App

PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 3 Classification of Elements and Periodicity in Properties2 Marks
Question
Use the periodic table to answer the following questions.
(a) Identify an element with five electrons in the outer subshell.
(b) Identify an element that would tend to lose two electrons.
(c) Identify an element that would tend to gain two electrons.
(d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.
✓

Answer

(a) Fluorine (F) : Electronic configuration $1 s^2$ $2 s^2 2 p^5$ or any other halogen $( Ll , Br , I )$.
(b) Mg or Ca , Electronic configuration of Mg : $1 s^2 2 s^2 2 p^6 3 s^2$. It looses two electrons and gain stable inert gas configuration.
(c) Oxygen (O) : This accept two electron and obtain stable configuration like Ne and form $O ^{-2}$ ion.
(d) $17^{\text {th }}$ group (halogens) : In this Br is liquid and $F , Cl$ are gases. $F , Cl , Br$ and I are non-metals while At is metal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from PART - 1 CH - 3 Classification of Elements and Periodicity in Properties→PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Calculate $\Delta_\text{r}\text{G}^\circ$ for conversion of oxygen to ozone, $\frac{3}{2}\text{O}_2(\text{g})\overrightarrow{\ \ \ \ \ }\ \text{O}_3(\text{g})$ at 298K, if KP for this conversion is 2.47 × 10-29.
→
Conjugate acid of a weak base is always stronger. What will be the decreasing order of basic strength of the following conjugate bases?
$\text{OH}^–,\text{ RO}^–,\text{ CH}_3\text{COO}^–,\text{ Cl}^–$
→
How standard electrode potential can be calculated and state its importance.
→
In 20 ml 0.2 N KOH , how much ml of 0.1 $N H _2 SO _4$ is added so that solution becomes neutral?
→
A sample of $HI ( g )$ is placed in flask at a presence of 0.2 atm . At equilibrium the partial pressure of $HI ( g )$ is 0.04 atm . What is $K _p$ for the given equilibrium?
$2 H I ( g ) \rightleftharpoons H _2( g )+ I _2( g )$
→
How would you convert the following compound into benzene?
Hexane.
→
The first $(\Delta_{1}\text{H}_{1})$ and the second $(\Delta_{1}\text{H}_{1})$ ionization enthalpies (in kJ mol–1) and the $(\Delta_{1}\text{H}_{1})$ electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Elements $\Delta\text{H}_{1}$ $\Delta{\text{H}}_{2}$ $\Delta_{\text{eg}}\text{H}$
I 520 7300 -60
II 419 3051 -48
III 1681 3374 -328
IV 1008 1846 -295
V 2372 5251 +48
VI 738 1451 -40
Which of the above elements is likely to be:
The metal which can form a stable binary halide of the formula MX2(X=halogen).
→
The Balmer series in the hydrogen spectrum corresponds to the transition from n1 = 2 to n2 = 3, 4, .......... This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n = 4 orbit.
(RH = 109677cm-1)
→
Write two important methods of formation of benzene.
→
$2 \times 10^8$ atoms of carbon are arranged side by side. Calculate the radius of carbon atom if the length of this arrangement is 2.4 cm .
→