Unit 2 Test

1. Microwaves have ________________ (higher/lower) energy then X-rays.

• higher

• lower

As wavelength increases the frequency __________________

• increases

• decreases

1. In the Gold Foil experiment, what was proven when particles bounced straight back?

• nothing

• negative particles were present

• nucleus (massive) was present

• only a neutron

The Mass Number is found by adding the number of ___________ and __________ together

• electrons and protons

• neutrons and protons

• neutrons and protons

• nothing

1. What is the overall charge of a carbon atom with 6 protons, 7 neutrons, and 3 electrons? ________

• + 1

• + 2

• + 3

• + 5

1. Cations are formed by electrons being _____________.

• more in number than protons

• equal in number to protons

• less in number than protons

• nothing

1. Atomic mass is a weighted average of the elements ____________.

• mass

• protons

• neutrons

• electrons

1. The nucleus of an atom is

• positively charged

• negatively charged

• no charge

• none of the above

1. An atom of an element with atomic number 48 and mass number 120 contains

• 78 neutrons 48 protons 48 electrons

• 72 protons, 48 electrons, and 48 neutrons

• · 120 protons, 48 electrons, and 72 neutrons

• · 72 protons, 72 electrons, and 48 neutrons

1. Between gold (Au) and silver (Ag) which is more electronegative? ______________

• Gold

• Silver