Cat. 1

Which of these substances are elements?

• S, Fe, O₂, Sr, and Al 
• S, O₂, and LiF
• N₂O₄, O₂, and LiF 
• N₂O₄, Fe, Sr, and Al 

the rows in The Periodic Table of Elements that contain elements with the same number of electron shells (rings)

• period
• column
• group
• family

an element that has both metal and non metal properties; found along the stairs (zig zag)

• metalloid
• metal
• non metal

the group 18 elements that are not reactive

• Non Reactive metals
• Noble Gases
• Reactive gases

the tiny particles that make up an atom; proton, neutron and electron.

• atom
• electron cloud
• nucleus
• subatomic particles

What so the blue circles represent?

• protons
• neutrons
• electrons
• nucleus

Which of these atoms will be more reactive and why? 

• Atom A, because it has fewer electrons.
  
• Atom A, because it has unequal charges.
  
• Atom B, because it gives up a valence electron. 
• Atom B, because it more neutrons. 

Tags

NGSS.MS-PS1-1

The number of negatively charged particles in the most outer shell.

• Valence Electrons 
• Valence Neutron
• Valence Proton
• Valance Particles

(8.5B) An atom of which element is represented by this model?

• Boron (B)
• Carbon (C)
• Neon (Ne)
• Sodium (Na)

Tags

NGSS.MS-PS1-1

What is the atomic number of an atom with 13 protons, 14 neutrons, and 10 electrons? 

• 1
• 13
• 27
• 37

Tags

NGSS.MS-PS1-1