similarities between their properties. The modern periodic table lists the elements in order of increasing atomic number (the number of protons in the nucleus of an atom). Historically, however, relative atomic masses were used by scientists trying to organise the elements. This was mainly because the idea of atoms being made up of smaller sub-atomic particles (protons, neutrons and electrons) had not been developed. Nevertheless, the basis of the modern periodic table was well
Words: 332 - Pages: 2
a property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter produces and also is influenced by electromagnetic fields. Antimatter is made of essentially of antiprotons, which is a normal proton with the electrical and magnetic charge reversed. Antimatter is affected by gravity. (NASA 2). Additionally when “antimatter and normal matter collide they release energy” (NASA 5). To make antimatter, scientists must get a high velocity electron
Words: 340 - Pages: 2
an element which consists of a proton (P), neutron (n) and an electron (e). Protons are positively charges, electrons are negatively charged and neutrons have no charges i.e. are neutral. Both the proton and neutron are located inside the nucleus while the electron is located outside the nucleus. Electrons have low mass compared to the weight of the protons and neutrons inside the nucleus. Electrons determine the chemical properties of an atom .the number of protons equals the number of electrons
Words: 505 - Pages: 3
unit of matter that retains the properties of an element. Atoms consist of positive protons and neutral neutrons which make a nucleus, and negatively charged electrons which orbits around the nucleus in a clouds. Protons Neutrons Electrons Charge Positive Neutral negative Location in atom Nucleus Nucleus Cloud/shell Size Same as neutrons smaller than electrons About the same as a proton Smaller than both protons and neutrons Function They determine the element Stabilize the atom Participate in
Words: 520 - Pages: 3
The theory of atoms and atomic history have been changing throughout history. The atomic theory has had many factors changed and restated to go along with the more recent discoveries. Today, we know all atoms have electrons, protons, neutrons, and of course, the nucleus. Those are a few of the fundamental terms we use to understand the basic structure of an atom. Those are just the simple building blocks of an atom. There is also a electron cloud that is around the nucleus. It was thought to have
Words: 799 - Pages: 4
weight of the atom.) Particle Location Weight Charge Proton Nucleus 1 amu Positive Neutron Nucleus 1 amu Neutral Electrons Electron Cloud 0 amu Negative Valence electrons: electrons in the outermost shell of an atom. Atomic Weight: the ratio of the average mass of atoms of an element (average weight of all the isotopes) (# of protons + # of electrons) Atomic Mass: the mass of a specific isotope Atomic number: the number of protons found in the nucleus of an atom Periods: In the periodic
Words: 273 - Pages: 2
are the building blocks of the universe. Atoms are so small that millions of them would fit on the head of a pin. Atoms are made of even smaller particles. The center of an atom is called the nucleus. It is made of particles called protons and neutrons. The protons and neutrons are very small, but electrons are much, much smaller. Electrons spin around the nucleus in shells a great distance from the nucleus. If the nucleus were the size of a tennis ball, the atom would be the size of the Empire
Words: 1406 - Pages: 6
The centre is called the nucleus. It is made of tiny particles called protons and neutrons. Electrons circle around the nucleus in clouds, or shells, far from the nucleus. When an atom is in balance, it has the same number of protons and electrons. It can have a different number of neutrons. Electrons stay in their shells because a special force holds them there. Protons and electrons are attracted to each other. We say protons have a positive charge (+) and the electrons have a negative charge (-)
Words: 350 - Pages: 2
1. Name the three subatomic particles and describe their location. Proton, Neutrons, Electrons and still other particles that are smaller than atoms are called subatomic particles. Proton, Neutrons are located at the center of an atom. The electrons are in motion at some distance from the nucleus. 2. Does the law of definite proportions apply to mixtures? Explain. Yes. This idea to apply to all matter – gases, solids and liquids 3. Does the law of definite proportions apply to elements? Explain
Words: 904 - Pages: 4
Science Assessment Task 3 – Script Technetium-99m An isotope of an element has the same number of protons but has a different number of neutrons. A radioisotope is an isotope that’s nuclei is unstable and therefore emits particles or rays of radiation. An example of a radioisotope is Technetium-99m. Technetium-99m emits gamma radiation. Gamma radiation is the highest frequency electromagnetic radiation that nuclei can emit, but don’t be scared just yet, because only such a small amount of radiation
Words: 414 - Pages: 2
