TEKS 8.5(A) Structure of Atoms

Which of these statements about the mass of subatomic particles are true?

• The mass of a proton is the same as the mass of an electron.

• The mass of a neutron is the same as the mass of an electron.

• The mass of a neutron is much greater than the mass of a proton.

• The mass of a proton is much greater than the mass of an electron.

Which table correctly identifies the charges of subatomic particles?

• 
• 
• 
• 

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

(a)  

How many neutrons are in the nucleus of a potassium atom with a mass number of 39?

(a)  

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Which statement accurately describes the atoms of a specific elements?

• An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.

• A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

Tags

NGSS.MS-PS1-1

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

(a)  

What is the difference between the number of electrons in an atom of selenium. Se, and the number of electrons in an atom of aluminum, Al?

(a)