How are the elements in the modern periodic table arranged?

• atomic mass

• chemical symbol

• element's name

• atomic number

All the matter is made up of the same atom. Which sentence correctly describes atoms?

• All substances are made of the same atom.

• An atom is the smallest particle of the nucleus.

• An atom is the smallest particle of an element.

• An atom is a substance that has been cut in half.

Use your periodic table. What is the atomic number for iron?

• 26

• 56

How many electrons does a sodium atom contain?

• 23

• 11

What subatomic particle has a positive charge?

• electron

• neutron

• proton

Group 18 elements are called the ______ ______.

• alkali metals

• alkaline earth metals

• noble gases

• transition metals

Neutrons are found in the nucleus of an atom and have a ______ charge.

Use your periodic table. The element neon has

• 10 protons, 20 neutrons, 12 electrons

• 15 protons, 15 neutrons, 15 electrons

• 0 protons, 0 neutrons, 0 electrons

• 10 protons, 10 neutrons, 10 electrons

Tags

NGSS.MS-PS1-1

The columns of the periodic table are called _____ while the rows are called _____.

• groups/families, periods

• periods, groups/families

The atomic number of an atom tells the number of ______ in the nucleus.