Periodic Table And Atoms Flashcards
How are elements in the periodic table arranged?
Elements in the periodic table are arranged in order of increasing atomic number.
What can the periodic table be used for?
The periodic table can be used to determine whether an element is a metal or non-metal.
What are groups in the periodic table?
Groups are columns in the periodic table containing elements with the same number of outer electrons, indicated by the group number.
Elements in the same group….
Elements in the same group share the same valency and have similar chemical properties because they have the same number of electrons in their outer energy levels.
The electron arrangement of what elements can be written.
The electron arrangement of the first 20 elements can be written.
What does an atom contain?
An atom has a nucleus, containing protons and neutrons, and electrons that orbit the nucleus.
What are the charges of different particles?
Protons have a charge of one-positive, neutrons are neutral and electrons have a charge of one-negative.
What are the masses of different particles?
Protons and neutrons gave an approximate mass of one atomic mass unit and electrons, in comparison, have virtually no mass.
What is the atomic number?
The number of protons in an atom is given by the atomic number.
What is in a neutral atom?
In a neutral atom, the number of electrons is equal to the number of protons.
What is the mass number equal to?
The mass number of an atom is equal to the number of protons added to the number of neutrons.
What are isotopes?
Isotopes are defined as atoms with the same atomic number but different mass numbers, or as atoms with the same number of protons but different numbers of neutrons.
What is nuclide notation?
Nuclide notation is used to show the atomic number , and mass number of atoms from which number of protons, electrons and neutrons can be determined.
How many isotopes do most elements have?
Most elements have two or more isotopes.
How can the average/relative atomic mass be calculated?
The average atomic mass had been calculated for each element using the mass and proportion of each isotope present. These values are known as relative atomic mass.
