Atomic Structure and Periodic Table

The atomic number of an element is the total number of which particles in the nucleus?

• neutrons
• protons
• electrons
• protons and electrons

What subatomic particles would you find in the nucleus of an atom?

• Protons only
• Protons and Neutrons
• Neutrons and Electrons
• Protons and Electrons 

What is the mass number of an atom?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

What is the mass number of an element with 40 protons, 40 electrons, and 46 neutrons?

• 80
• 6
• 86
• 126

In the modern periodic table,  elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Which is a halogen?

• Helium
• Chlorine
• Oxygen
• Neptune

Which is an alkali metal?

• Magnesium
• Iron
• Sodium
• Europium

Tags

NGSS.HS-PS1-1

What subatomic particle is electrically neutral (no charge)?

• Proton
• Ion
• Neutron
• Electron

What is the number of protons that the element shown in this image?

• 259
• 102
• 157

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 12 neutrons
• 12 electrons
• 12 protons
• 24 protons and neutrons