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DEFINITION

This is an atom of an element that has the same number of protons but different number of neutrons
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DEFINITION

average of the masses of the isotopes of an element
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ATOMS & PERIODIC TAB

ATOMS AND PERIODIC TABLE

DEFINITIONTERM
This is an atom of an element that has the same number of protons but different number of neutrons ISOTOPE
average of the masses of the isotopes of an element ATOMIC MASS
the electrons found in the outermost energy level of an atom VALENCE ELECTRONS
number of protons in the nucleus of an atom. ATOMIC NUMBER
the sum of the protons and neutrons in the nucleus of an atom MASS NUMBER
the positively charged particles found in the nucleus of an atom PROTONS
neutrally charged particles found in the nucleus of an atom NEUTRONS
negatively charged particles found in the electron cloud surrounding the nucleus of an atom ELECTRONS
What is the name of the group of elements that are the most reactive metals? ALKALI METALS (group 1)
Which group of elements are stable (unreactive)? NOBLE GASES (group 18)
Which group of elements are the most reactive nonmetals? HALOGENS (group 17)
What property are the groups in the periodic table arranged by? SIMILAR PROPERTIES
vertical columns of elements on the periodic table, arranged by similar properties GROUP
horizontal rows of elements on the periodic table PERIOD
How many periods and groups are on the periodic table? PERIODS-7, GROUPS-18
When elements from groups 1 and 17 combine, the elements from which group are most likely to lose an electron? GROUP 1 ELEMENTS, WHEN FORMING A COMPOUND WITH A GROUP 17 ELEMENT ARE MOST LIKELY TO LOSE AN ELECTRON
What causes an atom to be chemically reactive? (why will it tend to bond with other elements?) An atom is usually chemically reactive because its outer energy level is not full.
Who was the first person to create a periodic table of elements? Dmitri Mendeleev
If the atomic number of an element is 9 and the mass number is 20, what is the number of neutrons? 11
What is the name of the element with 20 protons? CALCIUM
How many elements are found in nature? 92
The dense, positively charged center of an atom is called the _ NUCLEUS
The chemical properties of an element depend the the location of these electrons
which group number is known as the noble gases? group 18
Group number 1 is known as __ the ALKALI METALS
Group 2 is known as the __ the ALKALINE EARTH METALS
Which group is more reactive, one or two? one--it has less valence electrons
What's the relationship between valence number and reactivity? In general, the more valence electrons, the lower the reactivity with the EXCEPTION of group 17 (Halogens). The halogens are very reactive because they only need one more electron to become stable.
If an element with atomic # 26 has 26 neutrons, is it an isotope? Explain choice. No, because the # of neutrons is same as # of protons.
If an element with atomic # 27 has 26 neutrons, is it an isotope? Explain choice. Yes, because the number of neutrons differs from # of protons.
Name this element: there's 2 electrons in 1st shell, 6 in second shell. OXYGEN (atomic # 8)
Name this element: there's 2 electrons in 1st shell, 8 in second shell, and 5 in last shell. PHOSPHORUS (atomic #15)
developed nuclear model of atom Rutherford
Which scientist proposed the "plum pudding" model? JJ. Thomson
In a single neutral atom the number of protons equals the number of __ electrons
a charged atom ION
if an element has more protons than electrons, then it's considered to be __ an ion
Created by: jsolari
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