Size of an Atom and Microscopes

What is an atom?

• The smallest particle of an element that retains its identity during a chemical reaction

• The smallest particle of an element that can change into a particle of another element during a chemical reaction

• The smallest indivisible particle of matter

• The smallest particle of a substance

Tags

NGSS.MS-PS1-1

What is the average size of most atoms in nano-meters (nm)?

• 0.1 nm

• 1 nm

• 10 nm

• 100 nm

What is the average size of most atoms in Angstroms (Å)?

• 0.1 Å

• 1 Å

• 10 Å

The angstrom (Å) unit is widely used to express the sizes of atoms. Choose the correct value of an angstrom from the list below.

• 1 Å = 0.1 nm

• 1 Å = 1 nm

• 1 Å = 0.1 m

• 1 Å = 0.1 cm

What does a nanometer (nm) equal to?

• 1 nm = 10^-9 m

• 1 nm = 10^-10 m

• 1 nm = 10⁹ m

What does an Angstrom (Å) equal to?

• 1 Å = 10⁹ m

• 1 Å = 10¹⁰ m

• 1 Å = 10^-10 m

• 1 Å = 10^-9 m

The radius of an atom of iron (Fe) is 1.26 x 10^-10 m.

Choose the answer corresponding to the radius of an iron atom expressed in Angstrom (Å) units.

• 1.26 x 10^-10 m = 1.26 Å

• 1.26 x 10^-10 m = 12.6 Å

• 1.26 x 10^-10 m = 126 Å

The size of an atom of gold is 1.44 x 10^-10 m.

How many atoms of gold could be lined up side by side in a line of 1.44 m?

• 10,000,000,000 atoms

• 1.44 x 10¹⁰ atoms

• 1 x 10^-10 atoms

• 0.0000000001 atoms

How many nano-meters are in 1 meter?

• 10,000,000,000 nm

• 0.000000001 nm

• 1,000,000,000 nm

• 0.0000000001 nm

How many Angstrom (Å) are in 1 meter?

• 10,000,000,000 Å

• 0.000000001 Å

• 1,000,000,000 Å

• 0.0000000001 Å