Chemistry Pre-Test

What does the 1.00794 stand for?

• Hydrogen

• atomic number

• atomic mass

• atomic explosion

Tags

NGSS.MS-PS1-1

The particles that are found in the nucleus of an atom are

• neutrons and electrons

• electrons only

• protons and neutrons

• protons and electrons

Where are electrons of an atom found?

• Nucleus

• Electron Cloud

• Some are in the nucleus and some in the electron cloud.

• They are moving everywhere.

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

• atomic mass

• atomic number

• valence electrons

• number of isotopes

What are the three main groups of the periodic table?

• groups

• metal

• nonmetals

• metalloids

• periods

Which two elements are in the same period?

• boron (B) and lithium (Li)

• beryllium (Be) and calcium (Ca)

• phosphorus (P) and oxygen(O)

• boron (B) and phosphorus (P)

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons

• 8 protons

• 8 neutrons

• a mass number of 8

Tags

NGSS.MS-PS1-1

The negatively charged particles of an atom are the ______.

• electrons

• protons

• neutrons

• protons & neutrons

Tags

NGSS.MS-PS1-1

How many electrons are in the element, Oxygen, with the atomic number of 8?

• 7

• 10

• 8

• 9