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Atomic structure
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19-The electron configuration of potassium is ..............
2, 8, 8, 1
18-..................Shows an element's chemical symbol, atomic number, atomic mass and symbol for state of matter at room
element key
17-The nucleus is positively charged because it has...
positive protons and Neutrons (no charge)
16-The atom is neutral (uncharged) in ordinary state because .........................
no. of protons = no. of electrons
15-What is the electron configuration of nitrogen ..........
2,5
14-The group no. = the no. of electrons in outer shells ( valence electrons )
True
13-The period no. = the no. of shells
True
12-Locate the position of 20Ca in the modern periodic table Mg ( 2, 8,8, 2 )
period 4 - group 2
11-The chemical symbol of magnesium is ....................
Mg
10-Where are electrons found in an atom?
in the energy levels
9-Number of neutrons is equal to mass no. - atomic no.
True
8-The __________ is the sum of the protons and neutrons in the nucleus of that atom.
mass number
7-The _________ equals the number of protons in an atom of that element
atomic number
6-The dense, positively charged mass located in the center of the atom.
nucleus
5. What is the mass number of aluminum  (Al)?
27
4. Atoms of the same element must always have the same number of _________
protons
3- How many neutrons are in an atom of sodium (Na)? (Remember : Neutrons no. = Mass no. - Atomic no. )
23 - 11 = 12
2. How many electrons are in an atom of carbon (C)? (Remember : Atomic Number = no. of Protons or no. of Electrons)
6
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