1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pychu [463]
2 years ago
5

I NEED HELP FAST!!!!! Can you tell me about the development of the periodic table??? I have a DBA in a few minutes and I don't k

now!!! Please use easy to understand answers 'cause I'm a little under the weather.
Chemistry
1 answer:
weqwewe [10]2 years ago
5 0
Dimitri Mendeleev was the first to put elements together on a table. He knew there were elements missing but he noticed a trend in some of the elements known at the time. Sodium, Lithium and other alkali metals all have the same properties so he put them under the same column and created other columns with similar attributes (Halogens, Noble gases, Alkaline earth metals). Over the years, new elements were discovered and put into the rough outline that Mendeleev created.

I hope that is about what you wanted. 
You might be interested in
2. What is the mass of 5.33 x 10 moles of aluminum hydroxide?​
bearhunter [10]
<h3>Answer:</h3><h3>1865.5g</h3><h3>Explanation:</h3><h3 /><h2> first the chemical formular for ammonium hydroxide is NH4OH</h2><h3>its molarmass is given as N=14H=1O=16 </h3><h3> so we have 14 +1(2) +16+1 =35</h3><h2>also no of moles = mass / molarmass</h2><h3> we have 5.33×10 = mass/35 </h3><h2>therefore mass = 35 ×5.33×10 = 1865.5g</h2>
8 0
2 years ago
What kind of nuclear reaction would result in the release of a beta particle
lorasvet [3.4K]
Beta decay converts a neutron to a proton and emits a high-energy electron, producing a daughter nucleus with the same mass number as the parent and an atomic number that is higher by 1.
3 0
3 years ago
Question 3 of 6
Bond [772]

Answer:

c,d,e

Explanation:

3 0
3 years ago
Entropy measures _____. 1 point<br> A. Energy<br> B. Heat Transferred<br> C. Disorder<br> D. Force
dlinn [17]

Answer: Option (C) is the correct answer.

Explanation:

The degree of randomness or disorder is known as entropy. This means that more randomly or rapidly the molecules of a substance are moving in a container or in the Universe more will be its entropy.

For example, gases move more rapidly that solids or liquids and hence gases have high entropy.

Therefore, we can conclude that entropy measures disorder.

7 0
3 years ago
Read 2 more answers
Scientific notation does not allow chemists to represent numbers that have many figures in a shorter format.
ira [324]
It is false .... hope this helps

have a good day ! Thanks
8 0
2 years ago
Other questions:
  • 1. Compare and contrast the characteristics of metals and nonmetals.
    9·2 answers
  • Iven the parent compound, draw the mass spectrum fragment that is observed at m/z 77. include any hydrogen atoms and the charge.
    12·1 answer
  • What is one advantage of using a computer over a graphing calculator?
    12·2 answers
  • An open flask sitting in a lab refrigerator looks empty, but it is actually filled with a mixture of gases called air. If the fl
    11·1 answer
  • How so you kniw when you need to use ate, ide, and ite
    7·2 answers
  • Consider the sulfur difluoridemolecule.What is the central atom? Enter its chemical symbol.How many lone pairs are around the ce
    9·1 answer
  • Research some ways in which scientists and engineers have harnessed and currently use the energy in fossil fuels to benefit soci
    5·1 answer
  • How do I find lattice energy with the overall heat of dissolution of aluminum sulfate?
    13·1 answer
  • Al (s) + HCl (aq) --&gt; AlCl3 (aq) + H2 (g) Balance this equation
    6·1 answer
  • consider the fourth period elements ca, mn, co, se, and kr. which of these atoms are paramagnetic? a) ca, mn, co b) mn, co, kr c
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!