English

Define Ions

Advertisements
Advertisements

Question

Define: Ions

Definition
Advertisements

Solution

An atom which becomes charged by losing or gaining electrons is called an ion.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Atomic Structure - Additional questions

APPEARS IN

S.P. Singh Concise Chemistry [English] Class 7 ICSE
Chapter 4 Atomic Structure
Additional questions | Q 1.1

RELATED QUESTIONS

If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.


Tick the most appropriate answer.

Who discovered that radioactive rays are given out by uranium?

  1. Henri Becquerel
  2. Marie Curie
  3. Pierre Curie
  4. Schmidt

WRITE SHORT ANSWER

What is radioactivity?


Write the names of `"FeS"` compounds :


What is the maximum number of electrons present in:

1. first shell
2. second shell
3. third shell and
4. fourth shell


A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.

What is the atomic numebr of X ?


Why is it not possible to see an atom even with the most powerful microscope ?


How many times is a proton heavier than an electron?


An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?


Select the correct answer to the statement given below:

The basic unit of matter is not capable of independent existence.


The smallest particle of matter that can exist by itself is ______.


The basic unit of matter is ______.


The smaller particles found in the atom is called ______.


An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.


Which of the following has maximum number of atoms?


A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?


Write any two observations which support the fact that atoms are divisible.


The first scientific theory about atoms was given by J J. Thomson.


A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×