English

Write ‘True’ Or ‘False’ for the Following Statement an Atom on the Whole Has a Positive Charge. - Chemistry

Advertisements
Advertisements

Question

Write true or false for the following statement

An atom on the whole has a positive charge.

Options

  • True

  • False

MCQ
True or False
Advertisements

Solution

false

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Atomic Structure - Exercise [Page 51]

APPEARS IN

Selina Concise Chemistry [English] Class 8 ICSE
Chapter 4 Atomic Structure
Exercise | Q 2.1 | Page 51

RELATED QUESTIONS

Complete the following table.

Atomic number Mass number Number of Neutrons Number of protons Number of electrons Name of the Atomic species
9 - 10 - - -
16 32 - - - Sulphur
- 24 - 12 - -
- 2 - 1 - -
- 1 0 1 0 -

 Give the following a suitable word/phrase.

Atoms of same element with same atomic number but a different mass number.


What is the significance of atomic numbers in the modern Periodic Table?


Match the atomic numbers 4,8,10,15 and 19 with the following:

Element with four shells


Define the term ‘atomic number’ of an atom.


Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Carbon – \[\ce{^12_6C}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]


Match the statements in List I with the correct answer from List II.

List I List II
1. Mass number of an atom is the number of protons and A: Electron
2. The sub-atomic particle with a negligible mass. B: Argon
3. An atom having stable electronic configuration. C: Nitrogen
4. A molecule formed by sharing of electrons [covalency] D: Sodium
5. A metallic atom having unstable electronic configuration. E: Neutrons

The diagram represents an isotope of hydrogen [H]. Answer the following:


Atomic no. = 1
Mass no. = 1

Which sub-atomic particles in the 3 isotopes of ‘H’ are the same.


The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,

  1. what will be the ratio of their sizes?
  2. If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.

Give short answer:

what is the atomic mass number? mention its formula.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×