Unit 2 RETAKE (PS.2a) Atomic Theory

What does the nucleus of an atom contain?

• electrons

• neutrons

• protons

Tags

NGSS.MS-PS1-1

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons and neutrons

Tags

NGSS.MS-PS1-1

__________ are negatively charged particles that are in the orbitals around the nucleus.

• Protons

• Neutrons

• Electrons

Tags

NGSS.MS-PS1-1

The number of ​ (a)   is equal to the number of electrons in a ​ (b)   atom.

• protons
• neutrons
• charged
• neutral

_________ is a proposed explanation, for a scientific problem, made as a starting point for further investigation. 

• Hypothesis
• Theory
• Law

_________ is a a well-substantiated explanation of HOW or WHY. 

• Hypothesis
• Theory
• Law

Tags

NGSS.MS-LS1-3

NGSS.MS-LS4-2

Scientific _______ explain a pattern in nature observed over and over. 

• hypothesis

• theory

• law

Tags

NGSS.MS-PS2-4

Which theory was the first atomic MODEL proposed? 

• Billiard Ball

• Electron Cloud

• Planetary Model

• Plum Pudding

Tags

NGSS.MS-PS1-1

Scientists do not update the atomic theory when they discover new information. We still believe that the atom is like a billiard ball. 

• False, scientists update the atomic theory when new information is discovered
• True, the atomic theory has not been updated since the 1800's.

Why didn't scientists show the nucleus, electrons, protons, or neutrons in the Billiard Ball Model?

• No need, this was common knowledge.

• The scientists were lazy.

• These particles had not been discovered yet.

Tags

NGSS.HS-PS1-8