Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt CO
(b) Carbon c
(c) Aluminium AL
(d) Helium He
(e) Sodium So
(a) Cobalt CO is incorrect.
The correct symbol is Co.
(b) Carbon c is incorrect.
The correct symbol is C.
(c) Aluminium AL is incorrect.
The correct symbol is Al.
(d) Helium (He) is correct.
(e) Sodium So is incorrect.
The correct symbol is Na.
Related Articles
- The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as follows. Which symbol is the correct one ?(a) CO (b) AL(c) He (d) So
- (a) Give two symbols which have been derived from the 'English names' of the elements.(b) Give two symbols which have been derived from the 'Latin names' of the elements.
- In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):
- The following diagram shows a part of the periodic table containing first three periods in which five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):
- Give the names and symbols of five familiar substances which you think are elements.
- Name the following compounds. Also write he symbols/formulae of the ions present in them :(a) CuSO4(b) (NH4)2SO4(c) Na2O(d) Na2CO3(e) CaCl2
- The atoms of which of the following pair of elements are most likely to exist in free state ?(a) hydrogen and helium (b) argon and carbon (c) neon and nitrogen (d) helium and neon
- Give one use each of the following metals:(a) Iron(b) Copper(c) Aluminium(d) Zinc(e) Mercury
- Which of the following are not compounds?(a) Chlorine gas(b) Potassium chloride(c) Iron(d) Iron sulphide(e) Aluminium(f) Iodine(g) Carbon(h) Carbon monoxide(i) Sulphur powder
- Give the formulae of the compounds formed from the following sets of elements :(a) calcium and fluorine(b) hydrogen and sulphur(c) nitrogen and hydrogen(d) carbon and chlorine(e) sodium and oxygen(f) carbon and oxygen
- (a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.(b) Arrange them in the order of their group also."
- Which of the following elements does not exhibit electrovalency?(a) calcium (b) chromium (c) carbon (d) cadmium
- The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the(a) electrolysis of their molten chloride(b) electrolysis of their molten oxides(c) reduction by aluminium(d) reduction by carbon
- The metals which can produce amphoteric oxides are:(a) sodium and aluminium. (b) zinc and potassium. (c) calcium and sodium. (d) aluminium and zinc
- Choose the correct option in each of the following:-1. Which of the following is a liquid at ordinary temperature?A. Carbon B. Phosphorus C. Oxygen D. Bromine2. Which of the following is/are solid nonmetals?A. Carbon B. Sulpher C. Phosphorus D. All of these3. Which of the followings is the best conductor of electricity?A. Silver B. Copper C. Aluminium D. Iron4. Which of the following will displace copper from a solution of copper (II) sulphate?A. Magnesium B. Aluminium C. Iron D. All of these5. Which of the followings gases is used in advertisement signs?A. Hydrogen B. Oxygen C. Nitrogen D. Neon
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies