Chemical

What is the Symbol of neon?

What is the Previous name of the tungsten?

• Stronian

• Argentum

• Uranus

• Wolfram

In which year did Jöns Jacob Berzelius use the English alphabet to represent the elements?

• 1947

• 1963

• 1813

• 1564

A material that is composed of only one type of particle is called _______

• Molecules

• Monatomic

• Helium

• Pure substance

What is the valency of carbon?

• 1

• 6

• 4

• 7

What are valence electrons?

• sum of the protons and neutrons

• protons minus electrons

• electrons in the inner shells

• electrons in the outer shell

A _______ is the force that holds atoms together in a compound.

• Chemical Formula

• Chemical Reaction

• Chemical Bond

• Synthesis Reaction

An atom with a different number of electrons than it should have (more or less) is called an ---

• isotope

• valence electron

• ion

• octet

Why do chemical bonds form?

• so the number of protons equals the number of electrons

• to fill the outermost electron level

• so an atom can become unstable

According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

• 2

• 4

• 8

• 10