Advertisements
Advertisements
Question
What are orbits or shells ?
Advertisements
Solution
The fixed circular paths along which electrons revolve round the nucleus.
APPEARS IN
RELATED QUESTIONS
Why is it not possible to see an atom with naked eyes?
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define: Relative atomic mass
Give two examples for each of ionic and covalent bond.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Name the three subatomic particles present in an atom.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
Is it possible to see atoms these days ? Explain your answer.
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
Name the gas that.
Turns moist starch iodide paper blue black.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
Define the following term with an example.
Metal
Which of the following statements made by Dalton has not undergone any change?
The most abundant type of atom is the universe is ______.
What is the fundamental particle of an element?
