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
chubhunter [2.5K]
3 years ago
14

Each element possesses unique chemical and physical properties. a. True b. False

Chemistry
1 answer:
belka [17]3 years ago
4 0
A. True Because Each element is made up of unique type of atom that has very specific properties
You might be interested in
calcium has atomic number of 20 how many electrons of a calcium atom are involved in chemical bonding
Lelu [443]

The answer is 2 electrons.


The electron configuration of calcium is 2:8:8:2

Calcium has two electrons in its outermost shell. These are its valence electrons and are the ones used in bonding with other elements.  Valence electrons of an atom are those electrons that are in its outer energy shell or that are available for bonding.

Calcium is a metal. When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms forming ions. The resulting compound is known  as an ionic compound.

For example, when calcium metal reacts with chlorine gas,   calcium gives up its two valence electrons and Chlorine accepts them resulting in a new substance called calcium chloride in which the two elements have ended up forming ionic bonds.

 


7 0
3 years ago
Read 2 more answers
How many moles of Al2O3 can be formed from 10.0 g of Al?
Nutka1998 [239]

Answer:

n Al=  10/27( mol)- >n Al2O 3 =5/27(mol)

Explanation:

3 0
3 years ago
When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the ph
Scrat [10]

Answer:

E = 12.92 × 10^(-16) J

Explanation:

Formula for energy is;

E = hc/λ

Where;

h is Planck's constant = 6.63 x 10^(-34) J.s

c is speed of light = 3 × 10^(8) m/s

λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m

E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))

E = 12.92 × 10^(-16) J

6 0
3 years ago
Please help need answer fast ???
Alika [10]

Answer: 1.33x10^-22g

Explanation:Please see attachment for explanation

6 0
3 years ago
If an individual proton has mass 1.007825 amu, and an individual neutron has mass 1.008665 amu, what's the calculated mass of a
german

Answer:

C) 237.96682 amu

Explanation:

The symbol for neptunium-236 is given as;

²³⁶₉₃Np

This element has 93 protons and (236 - 93 = 143) neutrons.

Mass Number =Total mass of Protons + Total mass of neutrons

Total Mass pf protons = 93 * 1.007825 amu, = 93.727725 amu

Total mass of Neutrons = 143 * 1.008665 amu = 144.239095 amu

Mass = 144.239095 + 93.727725  = 237.96682 amu

Correct option is option C.

7 0
3 years ago
Other questions:
  • Please answer each:) <3
    12·1 answer
  • 51.7ml at 27 Celsius and 90kpa to stp
    14·1 answer
  • I need to know the independent variable and the dependent variable and control variable
    14·1 answer
  • Calculate the concentration of OH in a solution that contains 3.9 10-4 M H30 at 25°C. Identify the solution as acidic, basic or
    5·1 answer
  • I can't understand this I need it done by 4:20​
    8·1 answer
  • Which type of seismic waves produces the most severe ground movement?
    5·1 answer
  • Please help me please
    12·1 answer
  • What volume will 2.04g of helium gas occupy at 100C and 1.13 atm?
    9·1 answer
  • 5F248+ 2NH3(8) ► NF418 + 6HF
    13·1 answer
  • Using the example of an ambulance, explain the Doppler Effect. Infer why the doppler effect can or cannot occur in all waves. PL
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!