Lesson 2: Atomic Structure

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

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

Tags

NGSS.MS-PS1-1

The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.

• 12.5
• 13
• 25
• 37

The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.

• 9
• 10
• 19
• 28

Tags

NGSS.MS-PS1-1

The nucleus of an atom contains 12 protons and 13 neutrons. If the atom is electrically neutral, how many electrons does this atom have?

• 13
• 12
• 14
• 20

The nucleus is ____________ charged whereas the electron cloud is ____________ charged. 

• negatively, positively
• negatively, negatively
• positively, positively
• positively, negatively