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
konstantin123 [22]
3 years ago
9

How many protons are in the nucleus of this atom? What is the mass number of this atom?

Chemistry
1 answer:
Anettt [7]3 years ago
3 0
Ummmmmmmmmmmmmmmmmmmmmmmmm, 21

You might be interested in
What is the name of this compound
lys-0071 [83]

Answer:

horizontal

Explanation:

5 0
3 years ago
Atoms of arsenic (As) are often added to silicon (Si) in a process called doping to change the conductivity of the silicon. How
IRINA_888 [86]

Answer:

d) An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.

Explanation:

This is an example of a n-type semiconductor. The additional electron introduced to the 'grid' of silicon atoms causes an increase in the conductivity of the silicon. This additional electron is introduced as arsenic loses its extra electron.

5 0
3 years ago
Read 2 more answers
Two reasons why emerging diseases are especially harmful to humans. (is science)
Aleonysh [2.5K]

Answer:

Many emerging diseases arise when infectious agents in animals are passed to humans (referred to as zoonoses). As the human population expands in number and into new geographical regions, the possibility that humans will come into close contact with animal species that are potential hosts of an infectious agent increases.

Explanation:

7 0
3 years ago
Lithium chloride crystallizes in a face-centered cubic unit cell with chloride ions occupying the lattice points and lithium ion
Evgesh-ka [11]

Answer:

6

Explanation:

The coordination number of a particular crystal structure arrangement is defined as the number of nearest neighbor atoms or ions surrounding an atom or ion.

We must note that in salts of the type MX, the coordination number of each ion must be equal. The structure of LiCl is built by placing each unit cell next to another such that ions residing in the corner, edge or face sites are shared between adjacent unit cells. The LiCl is in FCC arrangement.

Hence in LiCl, each Li+ ion is surrounded by 6 chloride ions.

7 0
3 years ago
Select the correct answer. What is the percent composition of silicon in silicon carbide (SiC)? A. 28% B. 50% C. 70% D. 142%
Nadya [2.5K]

Answer:

C. 70%

Explanation:

Atomic Mass of the silicon = 28 g.

Atomic mass of the Carbon = 12 g.

Total mass of the Silicon Carbide = 28 + 12

= 40 g.

Now, Using the formula.

% Composition = Mass of the silicon/Total mass of the compound × 100 %

= 28/40 × 100 %

= 70 %

Hence, % composition of the silicon in SiC is 70%

7 0
3 years ago
Other questions:
  • Which of the following compounds will experience hydrogen bonding? (2 points) NH3 HBr C2H4 H2SO4
    7·2 answers
  • How would technology affect the population growth rate?
    5·2 answers
  • What would likely happen if a hot saturated solution were filtered by vacuum filtration using a büchner funnel? (hint: the mixtu
    14·1 answer
  • How many years old are you if you have lived 1 billion seconds 31 years round this answer to 3 sig figs
    11·1 answer
  • How does a sample of helium at 15 degree Celsius compare to a sample of helium at 215 K?
    12·2 answers
  • What is necssesary for a plant to exhibit phototropism
    8·1 answer
  • TIMED TEST PLEASE HURRY!!! The development of a new experimental method is most likely to change a theory if it makes it possibl
    13·2 answers
  • The photo shows an old-fashloned mercury thermometer. Mercury is a liquid metal that expands when It Is heated. Mercury Narrow t
    9·2 answers
  • Which of the following is true about science? (10 points)
    10·1 answer
  • The abiotic components of an
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!