what are atoms and how do we know they exist?\n• an atom is the smallest particle of an that still has the…

what are atoms and how do we know they exist?\n• an atom is the smallest particle of an that still has the identity and properties of the element.\n• atoms are made up of particles (particles that are smaller than atoms).\n• these particles are, and \nsummary of the parts of an atom:\n| name | symbol | charge | location | relative mass |\n| proton | | | | |\n| neutron | | | | |\n| electron | | | | |\nthe nucleus\n• at the center of every atom is a \n• of the space inside an atom is taken up by the, the nucleus is \n• as atoms get bigger, the in the nucleus repel (push away from) each other more. so are required to make the nucleus stable.\n - neutrons are though to be needed to hold all the protons together in the nucleus\n - the bigger the nucleus, the are needed.\npractice\ntrue of false:\na) all matter is made of small particles called atoms \nb) atoms of one elements are different form the atoms of other elements \nc) electrons are locate in the nucleus of an atom \nd) most of the mass of an atom is concentrated in it’s electrons \ne) the nucleus contains protons and electrons \nf) the nucleus is the tiny, dense, central core of the atom.

what are atoms and how do we know they exist?\n• an atom is the smallest particle of an that still has the identity and properties of the element.\n• atoms are made up of particles (particles that are smaller than atoms).\n• these particles are, and \nsummary of the parts of an atom:\n| name | symbol | charge | location | relative mass |\n| proton | | | | |\n| neutron | | | | |\n| electron | | | | |\nthe nucleus\n• at the center of every atom is a \n• of the space inside an atom is taken up by the, the nucleus is \n• as atoms get bigger, the in the nucleus repel (push away from) each other more. so are required to make the nucleus stable.\n - neutrons are though to be needed to hold all the protons together in the nucleus\n - the bigger the nucleus, the are needed.\npractice\ntrue of false:\na) all matter is made of small particles called atoms \nb) atoms of one elements are different form the atoms of other elements \nc) electrons are locate in the nucleus of an atom \nd) most of the mass of an atom is concentrated in it’s electrons \ne) the nucleus contains protons and electrons \nf) the nucleus is the tiny, dense, central core of the atom.

Answer

Explanation:

Step1: Define atom

An atom is the smallest particle of an element that still has the identity and properties of the element.

Step2: Identify sub - atomic particles

Atoms are made up of sub - atomic particles. These particles are protons, neutrons and electrons.

Step3: Fill in atom parts summary table

Name Symbol Charge Location Relative Mass
Proton $p$ or $p^+$ + 1 Nucleus 1
Neutron $n$ or $n^0$ 0 Nucleus 1
Electron $e^-$ - 1 Electron - cloud outside nucleus $\frac{1}{1836}$

Step4: Complete nucleus description

At the center of every atom is a nucleus. A very small fraction of the space inside an atom is taken up by the nucleus, the nucleus is tiny and dense. As atoms get bigger, the protons in the nucleus repel each other more. So neutrons are required to make the nucleus stable. The bigger the nucleus, the more neutrons are needed.

Step5: Answer true - false questions

a) True. All matter is made of atoms. b) True. Atoms of different elements have different numbers of protons, neutrons and electrons, giving them different properties. c) False. Electrons are in the electron - cloud outside the nucleus. d) False. Most of the mass of an atom is concentrated in the nucleus (protons and neutrons). e) False. The nucleus contains protons and neutrons. f) True. The nucleus is the tiny, dense, central core of the atom.

Answer:

Question Answer
a) True
b) True
c) False
d) False
e) False
f) True