8th Grade Chemistry - Mock STAAR Review

positive charge, found in nucleus, mass = one

• proton
• neutron
• electron
• ion

no charge, found in nucleus, mass = one

• proton
• neutron
• electron
• ion

negative charge, found orbiting nucleus, mass is almost zero

• proton
• neutron
• electron
• ion

An atom of a certain element has 11 electrons, and a mass number of 23. This element is very reactive in room temperature. How many neutrons are in this atom?

• 11

• 12

• 33

• 23

Tags

NGSS.MS-PS1-1

What type of particles are found in the cloud surrounding the atom's nucleus?

• Neutral particles and positively charge particles

• Positive charge particles only

• Negatively charge particles and positively charge particles

• Negatively charge particles only

What number indicates the nucleus?

• 1
• 2
• 3
• 4

Where is most of the mass in an atom located?

• in the nucleus
• in the protons
• in the neutrons
• in the electrons

Tags

NGSS.MS-PS1-1

What is the mass number?

• the number of protons in the nucleus

• the sum of the number of protons and neutrons in the nucleus

• the number of electrons outside the nucleus

• the number of neutrons in the nucleus

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

• 14
• 7
• 15
• 18

Tags

NGSS.MS-PS1-1

An atom of which element has 37 protons, 48 neutrons and 1 valence electron?

• Neon (Ne)

• Carbon (C)

• Rubidium (Rb)

• Sodium (Na)