What are nodes can u explain me plz..?

According to the modern theory of structure of atom, electrons dont revolve in fixed orbits. Instead there are orbitals, where the probability of finding an electron is maximum (90 - 95%). Electrons are depicted as electron clouds, which is denser where the probability is more .So the nodes are the areas between the 3D orbitals, where there is no probability of finding electrons. It's formula is n-l-1 for the nodes and l for nodal planes. So total number of nodes is n-1

2. Specifically: (a) (Astron.)

One of the two points where the orbit of a planet, or comet, intersects the ecliptic, or the orbit of a satellite intersects the plane of the orbit of its

primary. (b) (Bot.)

The joint of a stem, or the part where a leaf or several leaves are inserted. (c) (Dialing)

A hole in the gnomon of a dial, through which passes

the ray of light which marks the hour of the day, the parallels of the sun's declination, his place in the ecliptic, etc. (d) (Geom.)

The point at which a curve crosses itself, being a double

point of the curve. See Crunode, and Acnode. (e) (Mech.)

The point at which the lines of a funicular machine meet from different angular directions; -- called also

knot. W. R. Johnson. (f) (Poet.)

The knot, intrigue, or plot of a piece. (g) (Med.)

A hard concretion or incrustation which forms upon

bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint. Dunglison. (h) (Mus)

One of the fixed points of a sonorous string, when it

vibrates by aliquot parts, and produces the harmonic tones; nodal line or point. (i) (Zoöl.)

A swelling.

[1913 Webster]

3. (Math., Computers)

A special point in a graph or diagram which is attached to other points by links. It is often labeled and represented graphically as a box or circle. A node

may represent any object which is related to other objects in a conceptual structure that can be represented as a graph, the relations being represented as links between the nodes

[PJC]

Ascending node (Astron.), the node at which the body is passing northerly, marked with the symbol ☊, called the Dragon's head. Called also northern

node. -- Descending node, the node at which the body is moving southwardly, marked thus ☋, called Dragon's tail. -- Line of nodes, a

straight line joining the two nodes of an orbit

The area in which electrons in orbitals can exist is defined by the probability function. This tells us how likely it is for the electron to be found at a certain point in space. From your definition this means that a node is a point where the electron will never be found.

That's precisely what it means - probability means "the odds." Probability is measured from zero to one - one means something will always happen, zero means it will never happen.

So, a node is a place where the odds of finding something are zero. Absolutely zero. No matter how hard you look, no matter when you look, you will never, ever, ever find an electron at a node, because there will never, ever, ever be one there.

nodes are the places where there is 0 probability to find electrons. you can't find the actual node it's more of a theoretical construct