Advertisements
Advertisements
Question
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Advertisements
Solution
(a) The symbol of an electron is e–.
(b) The symbol of a proton is p+.
(c) The symbol of a neutron is n.
APPEARS IN
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.
WRITE SHORT ANSWER
Name three inert gases.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the:-
Acetic acid
Write the names of `"Ca"("NO"_3)_2` compounds :
What are orbits or shells ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Fill in the blank
An _______ is electrically neutral.
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.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Define – Atom.
In the nucleus of `""_20"Ca"^40`, there are ______
Atoms of one element can be transmuted into atoms of other elements by ______
A change in the physical state can be brought about
The smallest unit of an element is ______.
