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Atom/ Periodic Table
Junior Cert Science
| Question | Answer |
|---|---|
| What is the definition of an atom | An atom is the smallest part of an element that still has the properties of that element |
| Name the three parts of an atom | Proton, Neutron, Electron |
| Which parts of an atom has an atomic mass of 1amu | Protons and neutrons |
| What part of an atom has an atomic mass of 1/1840amu | Electron |
| What charge has a proton | Positive |
| What charge has an electron | Negative |
| What charge has a neutron | Neutral |
| Where are protons and neutrons located | In the nucleus |
| Where are electrons located | In shells orbiting the nucleus |
| What is the atomic number | The atomic number of an atom is the number of protons it has in its nucleus |
| What does amu stand for | atomic mass unit |
| What is the electronic configuration of an element | This is a way of writing the arrangement of electrons numerically e,g, Sodium, atomic number=11, electronic configuration 2,8,1 |
| What is the mass number | The larger number listed below the element symbol in periodic table of elements its equals the number of protons + the number of neutrons |
| If an atom of sodium has 11 protons and its mass number is 23, how many neutrons does it have | 12 neutrons |
| What is an isotope | Isotopes are atoms of the same element, which have different numbers of neutrons |
| What do all elements in group 1 have in common | They all have 1 electron in their outer shell and they behave in a similar manner chemically |
| What do all elements in group 8 have in common | They all have a full outer shell and they behave in a similar manner chemically |
| How are elements arranged in the periodic table of elements | In order of increasing atomic number |
| What do you call the vertical columns in a periodic table | Groups |
| What are the Group 1 elements called | Alkali metals |
| Name three alkali metals | Lithium, sodium, potassium |
| What are group 2 metals called | Alkaline earth metals |
| Name two alkaline earth metals | Magnesium and calcium |
| What are group 7 elements called | Halogens |
| Name two halogens | Fluorine and chlorine |
| What are group 8 elements called | Noble gases |
| Name two noble gases | Helium and Neon |
| What are the horizontal rows in a periodic table called | Periods |
| What does the number of periods (rows) in a periodic table represent | The number of shells an atom has |
| What is the main division in the periodic table | Metals on the left and middle, non metals on the right |
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gcu science
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