What is the primary focus of this video?

• Molecular bonding

• Subatomic structure of atoms

• Chemical reactions

• States of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which subatomic particle determines the type of element an atom will be?

• Electrons

• Neutrons

• Protons

• Quarks

What is the mass of a proton or neutron in atomic mass units (AMU)?

• 0 AMU

• 1 AMU

• 2 AMU

• 0.5 AMU

What makes isotopes of the same element different from each other?

• Number of protons

• Number of electrons

• Number of neutrons

• Number of energy levels

How do electrons affect an atom's isotope status?

• They change the element

• They change the atomic number

• They do not affect it

• They change the mass

What does the atomic number of an element represent?

• Number of electrons

• Number of protons

• Atomic mass

• Number of neutrons

In isotopic notation, what does the symbol 'X' represent?

• Element symbol

• Atomic mass

• Atomic number

• Number of neutrons

What is the atomic mass of an atom with 9 protons and 10 neutrons?

• 19

• 29

• 10

• 9

Why are atomic masses on the periodic table given as decimals?

• Because they represent averages of isotopes

• Due to measurement errors

• To simplify calculations

• To account for electron mass

What information is omitted in hyphen notation?

• Number of neutrons

• Atomic number

• Atomic mass

• Element name