Question

@randolal i need some help on a few questions in chemistry pleeeaassee HELP??

Answer 1

yep

Answer 2

2. Many elements display a “range” of masses in nature due to
a. Chemical reactions
b. Decomposition
c. Isotopes
d. Varying number of protons


3. Thus far, within the last few decades, all the newly discovered elements have been
a. Synthetic, man-made
b. Found in nature
c. Found on meteorites
d. Found on the moon


4. The current periodic table is organized by
a. Atomic weight
b. Atomic mass
c. Atomic isotopes
d. Atomic number


5. Elements within the periodic table are organized in groups or families because
a. They have similar masses
b. They have the same number of protons
c. They have similar chemical properties
d. They have similar physical appearance


6. Isotopes are atoms of elements have the same number of __________ but different numbers of __________.
a. Protons, neutrons
b. Neutrons, protons
c. Protons, electrons
d. Electrons, protons

Answer 3

i got to get off but if you post the answers ill look at them tomorrow and ill let you know what is right :D i appreciate your help even if you don't know the answers :D

Answer 4

For many of the chemical elements there are several known isotopes. Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.

Answer 5

second one they have been man made because some of them produce the same elements that we use today

Answer 6

okay two was right but im still not sure what to put for the first one

Answer 7

nvm i got those done now if you would like to help me on the next 4 questions i will put them up :)

Answer 8

yes ill help

Answer 9

lol are u going to post them ;)?

Answer 10

ohhh ya the first one was isotopes ;) sorry

Answer 11

ya hold on I'm sorry i didn't know you answered back and thank you ill post them in a second

Answer 12

this is still for the same paper (Chemistry)

7. Illustrate why synthetic, or man-made, elements typically exist for only a short time. (2 pts.)

8. State 2 potential uses of better, more precise measurements of elemental masses. Cite textual evidence. (2 pts.)

9. As the title of the article states, is the periodic table wrong? Cite textual evidence. (2pts.)

10. When Mendeleev first created his periodic table he left gaps or empty spaces in many places within his table. Why was this
so? (2 pts.)

Answer 13

@randolal

Answer 14

To be honest I don’t know the firs one,

Answer 15

We use surface analysis to determine the chemical, elemental, and molecular composition of material surfaces and interfaces. Depending on the technique used, the surface being probed may constitute just the top monolayer of atoms (which some hold to be the only true surface), or it may extend several microns beneath the top monolayer. By bombarding a material with ions, electrons, X-rays, or photons in high vacuums, we map the elemental and chemical composition of specimens, study impurities and grain boundaries, gather bonding and chemical-state information, and perform depth profiles to determine doping and elemental distributions. Our surface analysis team boasts more than half a century of experience in analyzing surfaces for materials that range from photovoltaics to microelectronics to polymers to biological specimens. For these analyses, we offer several sophisticated and complementary techniques, including dynamic secondary ion mass spectrometry, static secondary ion mass spectrometry, Auger electron spectroscopy, and X-ray photoelectron spectroscopy. To augment these techniques, we have recently added a new capability to our repertoire — ion scattering spectroscopy — which we use primarily for elemental analysis of the outermost surface layer of a material.

Answer 16

I would say no the periodic table is not wrong, thats for the third one

Answer 17

Dimitri Mendeleev & The Periodic Table Derived by Dimitri Mendeleev, the periodic table may be one of the most informational tables contained in chemistry. By leaving gaps in the columns and rows, Mendeleev was allowing for the discovery of undiscovered elements of that time. From the properties of the elements surrounding these gaps, Mendeleev was able to predict the properties of these undiscovered elements. Finally, when other scientists discovered the tools of the periodic table, Mendeleev's achievements were recognized. Mendeleev was a versatile genius who was interested in many various fields of study, including pure and applied science. Dimitri Ivanovich Mendeleev. 1834-1907, was a Russian chemist, known for his development of the periodic table of elements. This is a table created to arrange the elements by their atomic number. Mendeleev was born in Tobolsk, Siberia. He studied chemistry at the University of Saint Petersburg. Until 1859, when he was sent to learn at the University of Heidelberg, he became aquatinted with the Italian chemist Stanislao Cannizzaro, whose views on atomic weight changed his thinking. Mendeleev came back to Saint Petersburg and became a professor of chemistry at the Technological Institute in 1863. He became professor of general chemistry at the University of Saint Petersburg in 1866. Mendeleev was a renowned teacher, and, because no good textbook in chemistry was available, he wrote the two-volume "Principles of Chemistry" which became a classic. During the writing of his book, Mendeleev tried to organize the elements according to their chemical properties and atomic mass. In 1869 he published his first of what became known as the periodic table, a table created to arrange the elements by their atomic number. In 1871 he published a better version of the periodic table, in which he left empty spaces for elements that were undiscovered. Mendeleev s chart and theories gained acceptance when three predicted elements gallium, germanium, and scandium were discovered and fit the places he had set aside.

Answer 18

lol sorry if ist a lil to much for u to read

Answer 19

@randolal can you not help?