Review Ions and Atoms

Pre-Check:

Why is the element sodium have a charge of zero?

• There are 12 neutrons.

• It has 11 p+ and 11 e-.

• It has 11 p+ and 10 e-.

What happens to the voltage (mV) over time as the heart is beating?

• The voltage stays the same.

• The voltage increases and decreases.

Tags

NGSS.HS-PS2-5

Hypothesis:

What do you think causes the voltage to change in a beating heart? (Use your prior knowledge; Guess if you cannot think of anything.)

Tags

NGSS.HS-LS1-3

Sodium (Na) has 1 electron (e-) in its outer shell (orbital). How can it make a full outer shell? (HINT: Think of which option would be "easier" for the atom.)

• Giving away or donating the outer electron.

• Taking on or accepting 7 more electrons.

Tags

NGSS.MS-PS1-1

Knowledge Check:

Why does Sodium become a +1 charge?

• Sodium gives away 1 e-, so it now has 1 less negative (-) charge.

• Sodium accepts 1 e-, so it now has 1 more negative (-) charge.

Knowledge Check:

Why does Chlorine (Cl) become a -1 charge?

• Cl donates an e-, so it now has 1 less negative (-) charge.

• Cl accepts an e-, so it now has 1 more negative (-) charge.

Which of the following would donate 1 e- and become a +1 charge like Na? (HINT: Find Group 1)

• Li

• He

Which of the following would accept 1 e- and become a -1 charge like Cl? (HINT: Find Group 17)

• F

• Ne

Tags

NGSS.MS-PS1-1

What do you think the body uses to increase (+) or decrease (-) voltages for nerve impulses? Use what you have learned about ions in this lesson to help answer this question. Take an guess.

Tags

NGSS.HS-PS1-7

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers