Periodic Table Quiz

The elements in the periodic table are arranged by ascending order of ................ Number?

• Neutron

• Proton

• Electron

• Nucleon

Answer explanation

The elements in the periodic table are arranged in ascending order of atomic number, which represents the number of protons in an atom’s nucleus.

An element from Group 18 is much lighter than air, making it ideal for filling balloons. Its lightness allows the balloon to rise and float above ground level. What element is this?

Answer explanation

Helium is a noble gas found in Group 18 of the periodic table, which includes elements known for their stability and lack of reactivity.

Helium is much lighter than air because it has a very low atomic mass.

Helium's non-reactive nature also makes it safe for balloon filling because it doesn't readily combust or react with other elements, unlike hydrogen, which is also lighter than air but highly flammable.

Which one below is the properties of transition element?

I. Hardness is in between compared to metals in group 1 and group 2

II. Solids with shiny surfaces

III. Have low density

IV. Have high melting points and boiling points

• I, II and IV

• II and III

• All above

• II and IV (

Answer explanation

-Statement I is not accurate, as transition elements are generally harder than the metals in Group 1 and Group 2, but their hardness is not “in between” those metals.

- Statement III is incorrect because transition elements usually have high density, not low density.

Figure above highlighted element in group 17 called halogens, what happens to the halogens as you moved down the group from F to I?

• Reactivity Increase

• Reactivity decrease

• Molecular size decrease

• The melting point will decrease

Answer explanation

As you move down Group 17 (the halogens) from fluorine (F) to iodine (I), the reactivity of the elements decreases. This is because halogens react by gaining an electron, and the ability to attract electrons decreases as you go down the group.

Lithium (Li) is used in rechargeable batteries for devices like phone and laptop. Based on its position in the periodic table, why is lithium suitable for this purpose?

• Has low reactivity, making it efficient for energy transfer

• It is a lightweight metal with high reactivity, making it efficient for energy transfer

• It is a noble gas and does not react easily

• It is a non-metal that is easy to handle

Answer explanation

 Lithium (Li) is in Group 1 of the periodic table, meaning it is an alkali metal with only 1 valence electron that it can easily lose. This makes it highly reactive and good at transferring energy. Lightweight: Lithium is one of the lightest metals, which helps make batteries smaller and easier to carry in devices like phones and laptops.

Which element belongs to Group 18?

• 
• 
• 
• 

Answer explanation

Group 18 elements are known as the noble gases, which are generally non-reactive because they have a full outer electron shell. Neon (Ne), Krypton (Kr), Helium (He) is in Group 18 of the periodic table, so it belongs to the noble gases.

Amphoteric acid are the ............. that can act both as acid and base

• Chemical substances

• Atoms

• Elements

• Oxides

Answer explanation

Amphoteric acids are chemical substances that can behave as both an acid and a base, depending on the environment they are in. They can donate a proton (acting as an acid) or accept a proton (acting as a base).

The atomic number of an element represents the number of protons in its nucleus.

• False

• True

Answer explanation

The atomic number of an element is defined as the number of protons in the nucleus of an atom of that element.

Examine the diagram , how many protons are in carbon??

Answer explanation

The notation  represents the element carbon with an atomic number of 6 and a mass number of 12. The atomic number (6) indicates the number of protons in the nucleus of a carbon atom. Therefore, carbon has 6 protons.

What happens when sodium (Na) comes into contact with water?

• No reaction

• Produces hydrogen gas and base

• Produces water

• Produces acid

Answer explanation

This reaction produces sodium hydroxide (NaOH), which is a strong base, and hydrogen gas (H₂)

chemical equations:

2Na + 2H2​O → 2NaOH + H2​