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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