Isotopes and Element Spectrums

Light is emitted when electrons

• move from one atom to another.

• collide with one another, releasing energy.

• move from a lower energy level to a higher energy level.

• move from a higher energy level to a lower energy level.

Tags

NGSS.HS-PS4-3

Which occurs if an electron transitions from n = 3 to

n = 2 in a hydrogen atom?

• Energy is absorbed, and visible light is emitted.

• Energy is released, and visible light is emitted.

• Energy is released, and infrared light is emitted.

• Energy is absorbed, and infrared light is emitted.

Which principal energy level change by the electron of a

hydrogen atom will cause the greatest amount of energy to be absorbed?

• n = 2 to n = 4

• n = 2 to n = 5

• n = 4 to n = 2

• n = 5 to n = 2

As the wavelength of electromagnetic radiation increases the frequency

• decreases

• increases

• does not change

• cannot be predicted

As the energy of electromagnetic radiation increases the frequency

• increases

• decreases

• does not change

• cannot be predicted

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. ⁷⁷₃₅X  II. ⁷⁷₃₃X  III. ⁸¹₃₇X  IV. ⁸¹₃₅ X

• I and II
• III and IV
• I and IV
• I and III

Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.

• 204
• 206
• 207
• 208

76 protons and 114 neutrons

• osmium-114

• osmium-76

• osmium-190

• osmium-190.23