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zak ali Inglês 17 flashcards

Flashcards do conjunto (17)

1what is an atom ?an atom is a small building block of particles
2what is an element ?an element is a substance which is made of one type of atom
3what is the nucleus made up of ?protons and nuetrons
4what is charge for protons ?it is positively charged
5what is the charge for electron ?electrons are negative
6what is a periodic table?the list of all elements known to man
7how many elements are in the periodic table?there are 118 elements in the periodic table
8what is the electronic configuration?electron configuration is the distribution of electrons of an atom or molecule (or other physical structure)
9how many electrons fit in the first shell?Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons
10what is an electronic shell ?An electron shell is the outside part of an atom around the atomic nucleus
11where is the nucleus placed?the nucleus is placed in the centre
12what is covalent bonding?this happens when a non metallic atom bond with each other
13what is ionic bonding ?this occurs when elements bond with non metallic elements
14what are ions ?an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
15what are cations ?a positively charged ion.
16what are the three element block ?transition,lanthanides,actinides
17what are the periodic groups ?a group (also known as a family) is a column of elements in the periodic table of the chemical elements.