SC.8.P.8.7

Which correctly identifies a part of the atom shown in the figure below?

• A: electron

• A: ion

• B: electron

• C: neutron

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NGSS.MS-PS1-1

Which correctly describes a part of an atom?

• The electrons are positively charged

• The neutrons are negatively charged

• The nucleus does not have a charge

• The protons are positively charged

If the two atoms shown are the same element, which statement is true?

• They have a different number of protons

• They have a different number of neutrons

• They have a different number of electrons

• They have a different number of nuclei

Tags

NGSS.MS-PS1-1

The illustration below show the electron configuration of a hydrogen atom. Why is this diagram a good representation of the location of electrons within the atom?

• Scientists know the exact location of electrons in all atoms so they call this the cloud

• Scientists can't determine the exact location of electrons in atoms so they call this the cloud

• Scientists have determined that electrons do not move so they call this the cloud

• none of the above

Tags

NGSS.MS-PS1-1

Each element is made up of different atoms. The table below compares two elements.

Element 1 Element 2

Atomic number 10 9

Atomic mass number 20 19

What do the elements in the table have in common?

• Atoms in each element have 10 nuclei

• Atoms in each element have 10 protons

• Atoms in each element have 10 neutrons

• Atoms in each element have 10 electrons

Tags

NGSS.MS-PS1-1

The table below shows the number of protons, neutrons, and electrons for four atoms. Which of the atoms is a different element, and describe what would have to happen for it to become the same element as the others.

Number of Protons Number of Neutrons Number of e^-

A 8 8 8

B 8 8 10

C 8 9 8

D 9 10 9

• Atom D is the different element. It would have to lose one proton to become the same element as the others.

• Atom B is the different element. It would have to lose two electrons so that the number of protons and electrons are equal

• Both atoms C and D are different elements. Each would have to lose one neutron so that the number of protons and neutrons are equal.

• Both atoms A and B are different elements. Each would have to gain one neutron so that number of protons and neutrons is no longer equal.

Tags

NGSS.MS-PS1-1