Atomic # Mass #
#p
#e
#n
charge
Symbol
1) 17
19
0
2)
180
71
109
3)
40
38
46
4) 92
238
86
206
5)
Pb4
82
6)
34
45
-2
7)
113
48
49
8) 21
42
0
31
9)
p.
15
10)
83
80
126

In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

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explanation: