Dalton

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom.  
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

Tags

NGSS.HS-PS1-7

Which of the following is not part of Dalton's atomic theory?

• Atoms are always in motion

• Atoms of the same element are identical

• All matter is composed of atoms and empty space

• Atoms can't be created or destroyed.They can be rearranged

Tags

NGSS.HS-PS1-7

Democritus and Dalton believed that ____________________.

• all atoms are made up of nuclei

• protons are positively charged

• atoms are divisible and can be rearranged

• changes in matter are due to changes in groupings of atoms

Sodium has an atomic number of 11, how many protons does this atom have?

• 22
• 11
• 12
• 2

Tags

NGSS.MS-PS1-1

Dalton's model of the atom is represented by which letter?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS1-1

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

Tags

NGSS.HS-PS1-1

Which of the following is not part of Dalton's atomic theory?

• Atoms are always in motion

• Atoms of the same element are identical

• All matter is composed of atoms and empty space

• Atoms can't be created or destroyed.They can be rearranged

Tags

NGSS.HS-PS1-7

Who stated that all atoms of the same element are excacty alike?

• Democritus

• Dalton

• Thomson

• Bohr

The first person to propose a theory about an atom called the Atomos Theory was _______________ .

• Democritus

• Rutherford

• Dalton

• Aristotle

Although all parts of Dalton's atomic theory are important, which one of the postulates is important to explain the observations summarized by the Law of definite Proportions?

• Atoms are very tiny particles

• Matter is composed of atoms

• Atoms of the same elements have the same properties

• Atoms chemically combine with other atoms in fixed, whole-number ratios