What element is this an atom of? It has 3 protons, 3 neutrons, and 3 electrons.

• nitrogen

• lithium

• beryllium

• carbon

Tags

NGSS.MS-PS1-1

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

Tags

NGSS.MS-PS1-1

What is the electrical charge of a proton?

• 1+
• 1-
• neutral
• 2-

Neutrons contribute to the _________ of the atom.

• Atomic Number

• Charge

• Mass

• Nothing

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

Tags

NGSS.MS-PS1-1

Horizontal rows on the periodic table are called?

• Columns
• Periods
• Families

Fluorine, chlorine, bromine, iodine, and astatine make up Group 17. Why are these elements grouped together?

• They are all very reactive nonmetals with similar chemical properties.

• They are all nonreactive gases with similar physical properties.

• Their atoms all have eight electrons in their outer energy levels.

• They all have the same atomic number.

Which of the following best describes the properties of metals?

• hard, brittle, and nonconductive
• liquid, dark, and conductive
  
• shiny, malleable, and conductive
• soft, oily, and very reactive

How are the elements in the periodic table arranged?

• by their atomic mass
• by their chemical symbol
• by their chemical name
• by their atomic number

What does the number of electrons in the outer level indicate about the element?

• how reactive the element is
• how malleable the element is
• how brittle the element is
  
• how ductile the element is