Protons, neutrons, electrons unit

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

12 electrons

Which of Dalton's four postulates were proven to be incorrect

2 and 3

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

25

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

6

Neutron

A subatomic particle that has no charge and that is found in the nucleus of an atom, has mass

Dalton's 1st postulate

All matter is comprised of extremely small particles called atoms

Isotopes

Aroms of the same element that have the same number of protons but different number of neutrons

Neon-22, what is the 22?

Atomic mass

protons+neutrons=

Atomic mass

Dalton's 2nd postulate

Atoms cannot be subdivided, created, or destroyed

Dalton's 3rd postulate

Atoms of a given element are identical

Dalton's 4th postulate

Atoms of different elements combine in simple whole number ratios to form chemical compounds(Law of multiple proportion)

Nucleus

Center of an atom, very dense

Where are electrons found?

Electron cloud

Where is most of the volume in an atom found?

Electron cloud

What is an atom mostly made up of?

Empty space

Which scientist conducted experiments using alpha particles and thin gold foil, which later helped him develop his model for the atom?

Ernest rutherford

What determines isotope identity?

Number of neutrons

What determines an elements identity

Number of protons

How do you calculate the percent of something

Part/whole•100

The difference between nuclear atom model and the plum pudding model

Plum pudding model lacked a nucleus

The particles of the atom you can find by knowing the atomic number.

Protons and electrons

What subatomic particles would you find in the nucleus of an atom?

Protons and neutrons

Which subatomic particles contribute the most to the mass of an atom?

Protons and neutrons

Isotopes of the same element have the same number of ___________ and different numbers of _____________.

Protons,neutrons

Who determined the nucleus of an atom

Rutherford

When the number of protons is equal to the number of neutrons

The atom is neutral

Who determined the charge to mass ratio of an electron

Thompson

What was Thompson's conclusion following the cathode ray experiment?

electrons were deflected because they have the same charge as the negative plate

Electrons

negatively charged subatomic particles, no mass

Proton

positively charged subatomic particle, has mass