Exploring Atoms and Elements

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Positron

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Ion

• Compound

Which of the following is a chemical element?

• Water

• Oxygen

• Carbon dioxide

• Glucose

What is the main purpose of the periodic table?

• To list all known compounds

• To organize elements based on their properties

• To show chemical reactions

• To display atomic models

Which step comes first in the scientific method?

• Forming a hypothesis

• Making observations

• Conducting experiments

• Drawing conclusions

Given the atomic number of sodium is 11, how many protons does a sodium atom have?

• 10

• 11

• 12

• 23

Tags

NGSS.MS-PS1-1

If an atom has 6 protons, 6 neutrons, and 6 electrons, what is its mass number?

• 6

• 12

• 18

• 36

Using the periodic table, determine the group number for the element chlorine (Cl).

• Group 1

• Group 2

• Group 17

• Group 18

Which statement best describes the difference between an atom and an element?

• An atom is a type of element.

• An element is made up of only one type of atom.

• Atoms are always molecules.

• Elements are mixtures of atoms.

A scientist observes that a certain element is a good conductor of electricity and is malleable. Using the periodic table, how should the scientist classify this element?

• As a nonmetal

• As a metalloid

• As a metal

• As a noble gas