Advertisements
Advertisements
प्रश्न
What is atomic number?
Advertisements
उत्तर
The number of electrons or protons in an atom is called the atomic number of that atom. It is represented by the letter Z.
APPEARS IN
संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
State the mass number, the atomic number, number of neutrons and electronic configuration of the following atoms.
`""^12""_6C, ""^16""_8O, ""^19""_9F, ""^20""_10Ne, ""_13""Al""^27, ""_17""Cl""^35`
Also, draw atomic diagrams for them.
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
Draw the orbital diagram of `""_20^40"Ca"^(2+)` ion and state the number of three fundamental particles present in it.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
The Atomic number of an element is 20. It has ______ valence electrons.
In which one of the following, the number of protons is greater than the number of neutrons but number of protons is less than the number of electrons?
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
