-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Resources
-
Arts, Commerce & Sciences
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Exams
Colleges & Courses
Predictors
-
Learn
Law Preparation
MBA Preparation
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Exams
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Classification of Elements as Metals, Nonmetals and Metalloids - (Concept)
The elements can be divided into three categories i.e, metals and non-metals and metalloids. Metals comprise more than 78% of all known elements and appear on the left side of the Periodic Table. Metals are usually solids at room temperature except mercury which is liquid at room temperature and even gallium and caesium also have very low melting points (303K and 302K. respectively). Metals usually have high melting and boiling points. They are good conductors of heat and electricity. They are malleable and ductile .
Non-metals are placed at the top right side of the Periodic Table. In a period, the property of elements change from metallic on the left to non-metallic on the right. Non-metals are usually solids or gases at room temperature with low melting and boiling points (boron and carbon are exceptions). They are poor conductors of heat and electricity. Most non- metallic solids are brittle and are neither malleable nor ductile. The elements become more metallic as we move from top to bottom in a group and the non- metallic character increases as we move from left to right in a period.
There are some elements whose properties are in between the metals and non-metals. They are known as metalloids. There are a total of 8 metalloids in the periodic table i.e, boron(B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At).
| Exam | Chapter |
| JEE MAIN | Classification of Elements and Periodic table |
Which of the following elements are examples of metalloids?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following is an alkali metal?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The lightest metal in the periodic table is :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which one of the elements is a non metal ?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the elements are metalloids?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The acidic , basic and amphoteric oxides, respectively, are:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The given elements are correctly arranged in order of metallic character in:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following elements is considered as a metalloid?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements, choose the most appropriate answer from the options given below :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The lustre of a metal is due to
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Select the incorrect option regarding metallic solids
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which is the only metal that exists in liquid form at room temperature?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Three elements X, Y, and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Which of the following represents the correct order of metallic character of the given elements ?
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The correct order of metallic character is
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Given below are two statements:
Statement I: Both metals and non-metals exist in p and d-block elements.
Statement II: Non-metals have higher ionization enthalpy and higher electronegativity then the metals.
In the light of the above statements, choose the correct answer from the options given below:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The electron sea model explains following physical properties of metal :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Choose the correct option which has only metals
| A. |
|
| B. |
|
| C. |
|
| D. |
|
Given below are two statements :
Statement (I) : An element in the extreme left of the periodic table forms acidic oxides.
Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.
In the light of the above statements, choose the correct answer from the options given below :
| A. |
|
| B. |
|
| C. |
|
| D. |
|
The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is:
| A. |
|
| B. |
|
| C. |
|
| D. |
|
In addition to displaying the classification of elements into s-, p-, d-, and f-blocks, Fig. 3.3 shows another broad classification of elements based on their properties. The elements can be divided into Metals and Non-Metals.
