Karteikarten
Lee Chemistry study guide
Karten in diesem Stapel (60)
- 1Mass of a Proton1 amu
- 2Mass of Electron1/1800 or approx. 0 amu
- 3mass of Neutron1 amu
- 4location of protonnucleus
- 5location of electronelectron cloud
- 6location of neutronnucleus
- 7electrical charge of protonpositive (+)
- 8electrical charge of electrongnegative (-)
- 9electrical charge of neutronnone/neutral
- 10What is an Atom?the smallest part of a substance that still acts like the substance
- 11Why is knowing the history of the atom important?1) over time, models are revised as new evidence is gathered
2) Scientific ideas are subject to change
3) each new model of the atom was built on the ideas of the earlier ones - 12Two major parts of the atomnucleus and electron cloud
- 13located in the center of the atom; contains protons and neutrons; is very densenucleus
- 14what is the charge of the nucleus?positive
- 15is outside the nucleus; only electrons are found hereelectron cloud
- 16charge of the electron cloudnegative
- 17Very outside of the electron cloudvalence shell or valence level
- 18where are valence electrons found?valence shell / valence level
- 19on the periodic table periods go..?left-to right (horizontal)
- 20when you move across a period...the properties of the elements change
- 21on the periodic table, group or families go..?up and down (vertical)
- 22when you move up or down a group/family, the elements...are similar because all the elements in this column have the same number of valence electrons
- 23what does periodic mean?occurring at regular intervals
- 24what are 3 things in your life that occur periodically?1) eating
2) sleeping
3) birthday - 25Periodic Lawthe properties of the elements reoccur in a predictable way when the elements are arranged by increasing atomic number
- 26Who is Dimitri Mendeleeva Russian chemist who helped create the modern Periodic table of elements
- 27how did Mendeleev arrange the elements?by increasing atomic mass
- 28an atom with more or less neutrons than it should have normally (a neutral atom)an isotope
- 29an atom with more or less electrons than it should have normally (a neutral atom)an ion
- 30when an atom has more electrons than protons it is called...?a negative ion
- 31when an atom has more protons than electrons it is called...?a positive ion
- 32where does all the mass of an atom come from?the nucleus
- 33if an atom has 7 protons, 7 electrons and 8 neutrons what is its mass?15 amu
- 34an atom of oxygen has how many protons?8
- 35can any oxygen atom ever have a different number of protons?no. it would be a different element then.
- 36an isotope is an atom that has more or less ______ than it should normally haveneutrons
- 37Is Silicone a halogen?yes
- 38is Bromine a halogen?no
- 39Is magnesium a metal?Yes
- 40Is Aluminum a metal?Yes
- 41Which of the following elements has the lowest atomic number? Helium, Nitrogen, Argon, LithiumHelium
- 42where do you find metals on the Periodic Table?left of the staircase
- 43where do you fine metalloids on the periodic table of elements?bordering the staircase
- 44where do you find nonmetals on the periodic table of elementsright of the staircase
- 45How many valence electrons do alkali metals have?1
- 46how many valence electrons do the carbon group have?4
- 47how many valence electrons do the boron group have?3
- 48how many valance electrons do the noble gasses have8
- 49how many valence electrons do the nitrogen group have?5
- 50how many valance electrons do the fluorine group have?7
- 51how many valence electrons do the alkaline earth metals have?2
- 52how many valence electrons do the oxygen group have?6
- 53what is the difference between an element and a compound?a compound is made of more than one element
- 54give 3 examples of elements1) nitrogen
2) carbon
3) oxygent
(any element on the periodic table) - 55give 3 examples of compounds1) H20
2) CO2
3) NaCl - 56if a compound has the elements ___________ and ___________ and was once part of a living thing it is called an _____________ compound?carbon, hydrogen, organic
- 57gram is the measurement for?mass
- 58liter is the measurement for?volume (liquids)
- 59cm^3volume (solid)
- 60meterlength
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- Karteikarten am Lee Chemistry study guide, erstellt von z.huggins_28 am 15/12/2014.
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