Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2b2f59b460d7261f60c.JPG' />
Find out the valency of atoms represented by the figure.
Question 2 :
Which of the following scientist identified the 'Stationary orbits' in the structure of an atom ?
Question 3 :
Which of the following element has an atom with one electron, one proton and no neutron ?
Question 4 :
An atom with 3 protons and 4 neutrons will have a valency of
Question 5 :
Which of the following scientist identified the 'Indivisibility of atoms' in the structure of an atom ?
Question 6 :
State true or false: In an atom the number of protons and electrons is always equal.
Question 7 :
Which of the following is the correct electron distribution of chlorine atom ? (Atomic number of chlorine is 17).
Question 9 :
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
Question 10 :
In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement ? (Yes/No)
Question 12 :
An element X has a mass number 4 and atomic number 2. Write the valency of this element?
Question 13 :
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
Question 15 :
Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be ______ and _______ respectively.
Question 16 :
Is it possible for the atom of an element to have one electron, one proton and no neutron. (Yes/No)
Question 17 :
Which of the following scientist identified the 'Neutron' in the structure of an atom ?
Question 19 :
Identify the $Mg^{2+}$ ion from the figure where, n and p represent the number of neutrons and protons respectively.
Question 20 :
Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be ______ and _______ respectively.