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
Nady [450]
4 years ago
15

What are the electrons for calcium

Chemistry
1 answer:
IRINA_888 [86]4 years ago
5 0
The traditional calcium atom has twenty protons and twenty electrons making it neutral.


The calcium in the pic is a calcium ion so the number of protons and electrons are not equivalent.


Since it's 2+ that means the ion is positively charged and for that to happen electrons are away.

So 20-2=18

There are 18 electrons
You might be interested in
Elements riddle: Without my next door neighbor, I wouldn’t be worth 6 cents. Who am I?
zalisa [80]
If I understand this right, the two elements are Nickel and Copper, elements 28 and 28, respectively. A nickel is worth 5 cents, and a penny, originally comprised of copper, is worth one - the total being six cents.
7 0
3 years ago
Which equivalence factor should you use to convert from 3.48 x 1018 atoms of magnesium (Mg) to moles of magnesium?
attashe74 [19]
You should divide by 6.02*10^23.
5 0
3 years ago
Calculate the amount of energy required to increase the temperature of 18.0 go vapor water from 275.0 degrees * C to 385 degrees
Archy [21]

Answer:

<u>The amount of energy required to increase temperature 275°C to 385°C is ΔQ =3.95208kJ</u>

Explanation:

Given :

  • <em>The mass of the water vapour is 18 g</em>
  • <em>The initial temperature : 275°C</em>
  • <em>The final temperature : 385°C</em>

According to the formula :

ΔQ = m*s*ΔT

Where ,

  • <em>ΔQ is the heat supplied</em>
  • <em>m is the mass of the substance (water vapour) = 18g</em>
  • <em>s is the specific heat of the substance ( water vapour) = 1.996Jg^{-1}K^{-1}</em>
  • <em>ΔT is the change in temperature =385-275=110K</em>

∴

ΔQ = 18*1.996*110\\=3952.08J

⇒ΔQ =3.95208kJ

8 0
4 years ago
Why is metal malleable?
sdas [7]

Answer:

this is their property and that's also what's make it a metal

Explanation:

do

6 0
3 years ago
The half-life of the radioisotope 158Eu is 0.77 h. How much time is required for a 160.0-g sample of 158Eu to decay to 2.07 g?
Grace [21]

Answer: e. 4.8 h

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  

a - x = amount left after decay process  

a) for rate constant

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{0.77hr}=0.9hr^{-1}

b) for 160.0 g to decay to 2.07 g

t=\frac{2.303}{0.9}\log\frac{160.0}{2.07}

t=4.8hr

The time  required for a 160.0-g sample of 158Eu to decay to 2.07 g is 4.8 hours

7 0
3 years ago
Other questions:
  • Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction if 9.9 g of Pb(NO3)2 are heat
    7·2 answers
  • What type of mutagens come from inside the body?
    6·1 answer
  • Which law is based on the graph that is shown below?
    14·1 answer
  • Name two substances that can be used to prepare hydrogen gas
    14·1 answer
  • Calculate the volume, in milliliters, of a 0.330 M KOH solution that should be added to 6.000 g of HEPES (MW = 238.306 g/mol, pK
    7·1 answer
  • Which equilibrium reaction will experience a shift towards the products in equilibrium position when the concentration of ni2+ i
    5·1 answer
  • A coffee-cup calorimeter contains 140.0 g of water at 25.1°C . A 124.0-g block of copper metal is heated to 100.4°C by putting i
    10·1 answer
  • Plz answer will give BRAINLIEST! Promise! Question is in picture! Due in 8 minutes!!
    6·1 answer
  • Please help ASAP and show work will make brianlist answer 1-3
    5·1 answer
  • There are 31.1 grams (g) in 1 troy ounce (ozt). How many ozt of gold are extracted from 1 short ton of average Nevada ore
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!