Bohr's Model

What is the name of this element?

• Lithium
• Boron
• Carbon
• Neon

Tags

NGSS.MS-PS1-1

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Tags

NGSS.MS-PS1-1

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

• 14
• 28
• 2
• None of these

Tags

NGSS.MS-PS1-1

How many electrons should Lithium have around its Lewis dot model?

• 1
• 2
• 3
• 4

How many electrons should Lithium have around its Lewis dot model?

• 1
• 2
• 3
• 4

How many electrons should Nitrogen have around its Lewis dot model?

• 1
• 3
• 4
• 5

Why did Mendeleev leave blanks in his periodic table?

• forgot elements
• left room for elements not yet discovered
• placed elements in wrong positions leaving gaps

Which of the following is an Alkali Metal? 

• Magnesium
• Chromium
• Sodium
• Fluorine 

Which of the following is an Alkali Metal? 

• Magnesium
• Chromium
• Sodium
• Fluorine 

Which of the following is a Noble Gas? 

• Krypton
• Chlorine
• Radium
• Gallium