Which statement best describes the electrons in this illustration?

1. the electrons are positively charged particles located outside the nucleus

2. the electrons are positively charged particles located inside the nucleus

3. the electrons are negatively charged particles located outside the nucleus

4. the electrons are negatively charged particles located inside the nucleus

Statement 3 is correct. the electrons are negatively charged particles located outside the nucleus

Explanation:

Step 1: Data

Electrons = Electrons are subatomic particles.

⇒They (usually) are negative charged.

⇒They are situated outside the nucleus.

⇒They are much smaller than the nucleus of the atom. (neutrons and                    protons)

Protons

⇒They (usually) are positive charged.

⇒They are situated inside the nucleus.

Neutrons

⇒They (usually)do not have a charge = neutral

⇒They are situated inside the nucleus.

Step 2:

1. the electrons are positively charged particles located outside the nucleus

⇒ False. Electrons are negative charged

2. the electrons are positively charged particles located inside the nucleus

⇒ False Electrons are negative charged and outside the nucleus

3. the electrons are negatively charged particles located outside the nucleus

⇒ This statement is TRUE

4. the electrons are negatively charged particles located inside the nucleus

⇒False. Electrons are located outside the nucleus

Statement 3 is correct. the electrons are negatively charged particles located outside the nucleus

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.