Chemical elements (in class)

What is an element?

• An element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.

• An element is a pure substance consisting only of atoms that all have the same numbers of electrons in their atomic nuclei.

• An element is a pure substance consisting only of atoms that all have the same numbers of neutons in their atomic nuclei.

The atomic number of an element in the periodic table is...

• The number of protons in the nucleus

• The number of neutons in the nucleus

• The number of electrons in the nucleus

What ae the lightests chemical elements?

• helium and oxygen

• oxygen and hydrogen

• hydrogen and helium

How many known elements are there in the periodic table?

• 100

• 110

• 118

• 117

• 120

What is the name of the last discovered element which is also the heaviest?

• tennessine

• oganesson

How many elements from the periodic table occur naturally on earth?

• 94

• 100

• 43

• 61

• 93

What's the name of element 94?

• technetium

• promethium

• francium

• neptunium

• plutonium

´These are solid elements at room temperature (except mercury), dense and very good conductors of heat and electricity.

• Metals

• Noble gases

• No metals

• Halogens

These elements are not good conductors of heat or electricity and are too weak to be rolled or stretched, they are mostly essential for biological systems

• Metals

• Noble gases

• No metals

• Halogens

´This group of seven elements whose natural state is gaseous , generally of very low reactivity also known as inert gases. They share most of its physical properties and are extremely stable.

• Metals

• Noble gases

• No metals

• Halogens