Waves, periodic table, and energy levels

Question 1

Element

Answer 1

An element is a pure substance made of only one type of atom.

Question 2

How many elements are there?

Answer 2

There are a limited number of elements (118)

Question 3

All substances are made up of either:

Answer 3

1. A single element

2. A combination of elements (compounds)

Question 4

How can you determine an element?

Answer 4

The number of protons

Question 5

Periodic table

Answer 5

The periodic table is a way of organizing the elements so that the repeating properties of the elements line up.

Question 6

What are the parts on the periodic table?

Answer 6

1. Atomic number
2. Element symbol
3. Element name
4. Average atomic mass

Question 7

Atomic number

Answer 7

Number of protons or electrons if an atom is neutral.

Question 8

Neutral atoms:

Answer 8

1. Have an equal number of protons and electrons

2. The atomic number is the number of the total electrons in that atom

Question 9

How many protons does the element Tc have?

Answer 9

43

Question 10

Wave

Answer 10

a wave is a disturbance that travels through space carrying energy.

Question 11

Frequency

Answer 11

The number of waves per second (measured in Hertz-Hz)

Question 12

Wavelength

Answer 12

The distance between each repeating wave (meters- m)

1. Peak to peak
2. Trough to trough

Question 13

Amplitude

Answer 13

The height of a wave going from middle to top, (measured in meters-m)

Question 14

Wave speed

Answer 14

Wave speed is how fast the wave moves away from it’s source (m/s-meters per second)

Question 15

Parts of a wave

Answer 15

1. Frequency
2. Amplitude
3. Wavelength
4. Wave speed

Question 16

Wave equation

Answer 16

v=f*lambda
v= Wave speed (m/s)
f=Frequency (Hz)
lambda= wavelength (m)

Question 17

What is another equation that can be used to find wave speed?

Answer 17

v=d/t

Question 18

Electrons have lower potential energy when:

Answer 18

they are closer to the nucleus, reaching a more stable state.

Question 19

Energy and electrons

Answer 19

1. Electrons can only have particular energies in atoms, called energy levels.
2. Electrons cannot have energies between levels

Question 20

Each energy level…

Answer 20

only holds a certain number of electrons

Question 21

What energy level do electrons fill first?

Answer 21

The lowest energy level. When it is full, the electrons start filling the next lowest energy level.

Question 22

What are the lowest and second-lowest energy levels called?

Answer 22

First and second energy level

Question 23

How many electrons can each energy level hold?

Answer 23

First energy level= max 2 electrons

Second energy level= max 8 electrons

Question 24

Number of energy levels for an atom:

Answer 24

The number of energy levels an atom has electrons in is the same row that element is in on the periodic table.

Question 25

Outermost energy level:

Answer 25

The highest energy level an atom has electrons in is called the outermost energy level. The number of electrons in the outermost energy level is the same as the number of main group elements in the last row of the periodic table.