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
vovikov84 [41]
2 years ago
15

What are the mass number of first 20 elements ?​

Chemistry
1 answer:
skelet666 [1.2K]2 years ago
7 0

Answer:

The atomic mass (mₐ or m) is the mass of an atom. Although the SI unit of mass is the kilogram (symbol: kg), atomic mass is often expressed in the non-SI unit atomic mass unit (AMU) or unified mass (u) or dalton (symbol: Da), where 1 AMU or 1 u or 1 Da is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest. The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy making minor contributions.

You might be interested in
Why do you think knowing enthalpy of reaction might be useful?
mr Goodwill [35]
The Enthalpy of Reaction is the adjustment in the enthalpy of a compound response that happens at a consistent weight. It is a thermodynamic unit of estimation helpful for figuring the measure of vitality per mole either discharged or created in a response.
8 0
4 years ago
Read 2 more answers
Why does the lack of snow in the mountains make drought cycles worse
expeople1 [14]

Answer:

lack of snow in the mountains makes drought cycles worse because mountains are a natural part of the water cycle.

Explanation:

Mountains play a critical part In the water cycle by capturing moisture in the air and it precipitates as snow and when it does this the snow will melt in the warmer seasons and flow down stream then following the rest of the water cycle if we didn't have this then the streams would run less and it would greatly disrupt the water cycle.

6 0
3 years ago
1. How many elements are in the following equation, FeCrO4 ?<br> 1<br> 2<br> 3<br> 4<br> O
N76 [4]

Answer:

there are 3 different elements in that equation

Explanation:

Fe is the element Iron, Cr is the element Chromium, and O is oxygen

8 0
3 years ago
Read 2 more answers
A hypothesis .........
Sphinxa [80]

Answer:

all of the above

Explanation:

a hypothesis is indeed the second step. it also can be tested since you made it beforehand. it also is supposed to be educated. so all of the above.

4 0
3 years ago
Read 2 more answers
The formula for dichlorine monoxide
Ugo [173]
Cl2O but the two is a little two after Cl
6 0
4 years ago
Read 2 more answers
Other questions:
  • Which food tastes acidic? tomato celery radish cucumber
    7·2 answers
  • Which sample of matter is classified as a solution? 1. H2O(s) 2. H2O(l) 3. CO2(g) 4. CO2(aq)
    15·2 answers
  • The lithosphere,asthenosphere,inner core,and outer core areas of earth are classified and divided into layers based on
    6·1 answer
  • How many meters are their in one kilometer
    11·2 answers
  • I don't know how to do this?helpppp!
    10·1 answer
  • How does food waste contribute to climate change?
    14·1 answer
  • What are the differences between HDL and LDL?​
    7·1 answer
  • What is the oxidation number of Mn in Ca(MnO4)2
    11·1 answer
  • 20.0 g of Nitrogen is produced when oxygen gas reacts with NO gas. 29.8 L of oxygen is required at STP to produce this 20.0 g of
    11·1 answer
  • Which pair of element types is most likely to form an ionic compound
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!