Unit 1 the atom

Unit 1 the atom

Subatomic particles

A matter of scale

Click the video and watch, then answer the questions on the next slide

Open Ended

How are the powers of 10 defined? What does it mean when one object is 1 x10^-14 meters in size?

The atom is the smallest particle of matter

Atoms consist of protons and neutrons in the nucleus and electrons in orbitals around the nucleus at different energy levels which correspond to the rows on the periodic table

The nucleus of the atom has protons and neutrons and makes up almost all the mass of an atom.  The unit is atomic mass unit or amu for short.  Each proton and neutron is also composed of quarks.

A quark (/kwɔːrk, kwɑːrk/) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei.

The particles inside an atom important facts

• Atomic mass unit is the unit of measure (amu)

• protons have a positive charge  +p  

• neutrons have a neutral charge 0n

• electrons have a negative charge  -e

  
  protons and neutrons each have 1 amu mass

• electrons have really small mass 1/1840 amu

What did you learn questions for understanding

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Multiple Select

The particles in the nucleus of an atom are called?

• protons

• neutrons

• electrons

• Both neutrons and protons

• all of the above

Fill in the Blank

The mass of the proton is

Fill in the Blank

The is the neutral particle in the nucleus of the atom

Multiple Choice

The neutral atom must have the same number of protons and electons true or false?

• True

• False

Multiple Choice

The neutral atom must have the same number of protons and electrons, but can have a different number of neutrons: true or false?

• True

• False

Multiple Choice

All of the mass of the atom is in the

• nucleus

• orbitals

• protons only

• neutrons only

Multiple Choice

All of the mass of the atom is in the

• nucleus

• orbitals

• protons only

• neutrons only