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Simple program to create Roc...

This is a simple program to create a rock, paper, scissors game that we used to play in our childhood.Note: This is a simple program and there is no graphical interferencefrom r...

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Biology | Annual exam 2020 |...

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Loveee

O Love!

                                                                            O Love!What do you know of love?Have you my friend ever been in love?To feel so vulnerable and so bar...

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Postulates of Bohr Atom Model

Bohr proposed a model of the hydrogen atom in 1911. He proposed two postulates: 1st postulates: An electron cannot revolve around the nucleus in all possible orbits as suggeste...

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Young's Double Slit Experime...

Check out the Young's Double Slit Experiment Visualization made by Joon Shakya to gain knowledge in a exciting and fun waySwipe to change the view. Click here to view it in sepa...

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Physics | Annual exam 2020 |...

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Qbasic Coding Challenge for ...

WAP that allows a user to create and modify an array of size 10. Below is the menu that should be displayed. Clear the arrayInsert element at locationDelete element at locationS...

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Physics. Midterm exam 2021. ...

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Maths. Midterm exam 2021. St...

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Chemistry. Midterm exam 2021...

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Newtons law of gravitation

The universal law of Gravita...

Force of attraction (F) = G.(m1m2) / d2Let us consider two bodies with mass m1 and m2 at the distance of d from their center.According to Newton's law of gravitation, the force ...

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Mister prabin

A chemical reaction expressed by writing the full names of reactants and products is called a word equation. For example:

Hydrogen + oxygen -----------> Water

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Mister prabin

Four factors that bring about a chemical change are:

> Heat                               > Catalyst
> Light                               Solution
> Pressure                        > Electricity

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Mister prabin

In the modern periodic table, the physical & chemical properties of the elements are changed to the periodic function of their atomic numbers instead of atomic weight which solves the problem with isotopes. All isotopes of some element represented by the same atomic number. All the gaps of Mendeleev's periodic table are filled by discovering new elements. The column for inert gases was developed and all groups have sub-groups. In this way, the modern periodic table removes all the demerits of Mendeleev's periodic table.

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Mister prabin

The atomic weight of an element expressed in grams is called gram atomic weight.

The molecular weight of a substance expressed in grams is called molecular weight.

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Mister prabin

We know, the properties of f-block elements are similar to the transition metals of d-block, However, their last electron enters count f-orbital. So, f-block elements are kept separately below d-block elements or transitional elements. Hence, these elements are called inner transitional elements.

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Mister prabin

The 14 elements from cerium te lawrencium after lutetium are called lanthanides.
The elements from thorium to lawrencium after actinium are called actinides.

These elements are placed at the bottom of the periodic table because of their similar properties. Lanthanides are rare metals whereas actinides are artificial radioactive metals. They show similar properties to the transitional elements. So, they are placed separately below the transitional elements in blocks of the modem periodic table.

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