Which element is known for being very soft and is used in atomic clocks?

• Thallium
• Lead
• Cesium
• Polonium

Which element is liquid at room temperature and has been used in thermometers?

• Polonium
• Mercury
• Francium
• Thallium

This element is so rare that it was named after a country. Which one is it?

• Thallium
• Francium
• Lead
• Cesium

Which element is known to glow blue in the dark due to its radioactivity?

• Polonium
• Cesium
• Thallium
• Francium

Which of these elements is known to cause hair loss if taken?

• Mercury
• Thallium
• Francium
• Lead

Which of the following elements can be found in old thermometers and is toxic?

• Cesium
• Lead
• Thallium
• Mercury

Mercury is a safe metal to touch with bare hands.

Lead is used in pencils to write with.

Plutonium is used to power some spacecraft.

Radon is a gas that is dangerous if it accumulates in homes.

Chlorine is safe to breathe in large quantities.

Fluorine is one of the most reactive elements on the periodic table.

Beryllium is used in making windows for X-ray machines.

Polonium is an element that was discovered by Marie Curie.

Cadmium is a healthy mineral needed in the human diet.

Thallium is a safe metal for humans to touch.

Lead can be found in old paint and is harmful if eaten.

Which element is known as 'the silent killer' because it is very poisonous?

• Thallium
• Lead
• Mercury
• Francium

Water is made of two hydrogen atoms and one oxygen atom.

Oxygen is necessary for humans to breathe.