Introduction to Atoms

Which part of an atom is POSITIVELY charged?

• protons
• neutrons
• electrons
• atoms

What part of an atom is NEGATIVELY charged?

• protons
• neutrons
• electrons
• atoms

Which part of an atom has no charge?

• protons
• neutrons
• electrons
• atoms

The mass of an atom is found by adding its protons and _______.

• electrons

• nuetrons

• nucleus

The mass number of iodine is 126, and it’s in the 53rd place in the periodic table. It has ________________ protons and ______________ neutrons.

• 126 protons and 53 neutrons

• 53 protons and 126 neutrons

• 53 protons and 73 neutrons

• 73 protons and 53 neutrons

Tags

NGSS.MS-PS1-1

The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?

• 18

• 36

• 48

• 72

Tags

NGSS.MS-PS1-1

Identify the model

• Thomson model

• Dalton model

• Bohr Model

• Rutherford model

Tags

NGSS.MS-PS1-1

What does the nucleus of an atom contain?

• Electrons & Neutrons
• Protons & Neutrons
• Neutrinos & Positrons

Tags

NGSS.MS-PS1-1

What are electrons?

• Massive, positively charged particles
• Tiny, negatively charged particles
• Clouds of dust in the nucleus
• Neutral particles around the nucleus

Tags

NGSS.MS-PS1-1

Which subatomic particles contribute the most to the mass of an atom?

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