Me i beg you i really need
elements on the periodic table appear together in regions ba...
Chemistry, 06.11.2019 21:31 bryanmcmillianjr
Me i beg you i really need
elements on the periodic table appear together in regions based on the energy sub-level that contains their outermost valence electrons. what are these regions called?
families
blocks
main-group elements
transition elements
mendeleev's periodic law has been restated to say that when the elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties.
true
false
in 1894, william ramsey discovered the first of several non-reactive elements. which group of elements did ramsey discover that would alter the structure of the periodic table?
the transition metals
the noble gases
the halogens
the alkali metals
which of the following elements is man-made?
platinum
technetium
radon
cesium
what is the name of the group (family) that includes the elements radium, strontium, and magnesium?
noble gases
metals
alkaline earth metals
alkali metals
an element's atomic number is an indicator of its atom's:
number of protons
number of neutrons
charge
weight
an atom of oxygen contains 8 protons, 8 electrons, and 16 neutrons.
true
false
which of the following is not true of electronegativity?
generally increases as atomic radius decreases within a period
generally decreases as atomic number increases within a period
generally decreases as the principal energy level increases within a group
generally increases as atomic radius decreases within a group
which of the following elements possesses the most valence electrons?
argon
fluorine
helium
plutonium
how many dots should be drawn around the symbol, c, to create the lewis dot structure for a carbon atom?
two
four
six
eight
to achieve an octet in the valence energy level, a nitrogen atom will lose five electrons.
true
false
to achieve an octet in the valence energy level, a sulfur atom will become a cation.
true
false
Answers: 3
Chemistry, 22.06.2019 00:30, tdowling331
What must happen before a body cell can begin mitotic cell division
Answers: 2
Chemistry, 22.06.2019 00:30, amaliathornton22
Microtubular fibers that assist in the movement of chromosomes during nuclear division in conjunction with proteins, makes up the small and large organelle pieces that assemble prior to translation three-base nucleotide sequence that can complementarily pair with the functional transcript, allowing a particular material to be brought to a ribosome particular time in the cell cycle when the cell’s systems determine if the cellular conditions are appropriate to continue through the cycle time in the cell’s cycle when proteins are made and organelles are duplicated enzyme that allows proper nucleotide bonding during transcription specific dna sequence which will initiate gene transcription division of the cell’s cytoplasm specific bond that forms between two amino acids when a carboxyl group binds to a amino group three-base sequence that does not code for a particular amino acid a paired organelle which facilitates the formation of movement microtubules time in the cell’s cycle when the microtubular structures exert an equal pressure on the cell’s genetic material
Answers: 2
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