What is the weight, on Earth, of a book with a mass of 16 kg? 16N 65N 113N 147N

Consider the element carbon. How many electrons can be found in a carbon atom? How many are valence electrons?

Eva8 [605]

Answer:

option B= 6 : 4

Explanation:

Properties:

1. Carbon have six electron and six proton.

2. The two electrons are present in first shell while remaining of four electrons are present in the second shell.

3. it is non-metallic element and present in the group fourteen of periodic table.

4. its atomic mass is 12.0107 u.

5. its melting and boiling point is 3550 °C and 4827 °C respectively.

Uses:

1. it is used as a fuel in the form of coal.

2. in the form of graphite it is used in dry cells, as a lubricant, in pencil and high temperature crucible.

3. it is also used in jewelry in the form of diamond and because of its hard nature used in industries for drilling, polishing, cutting and grinding.

4. carbon black powder is used in printer ink.

5. its most common alloy with iron is steel.

6. it form variety of compound with number of other elements like nitrogen, hydrogen, oxygen etc.

Electronic configuration:

1s2, 2s2, 2p2

Isotopes of carbon:

There are fifteen isotopes of carbon from C8 - C22. The isotopes C12 and C13 are stable while C14 is radioactive.

4 0

4 years ago

Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C pre

Ahat [919]

Answer: The age of the tool is 15539 years

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 = 100

a - x = amount left after decay process = $\frac{15.5}{100}\times 100=15.5$

a) for completion of half life:

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

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

$k=\frac{0.693}{5730yr}=0.00012yr^{-1}$

b) for 15.5 % of original amount

$t=\frac{2.303}{0.00012}\log\frac{100}{15.5}$

$t=15539years$

Thus age of the tool is 15539 years

8 0

3 years ago

Compare the densities of hydrogen, oxygen, and water.

riadik2000 [5.3K]

Answer:

Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.

8 0

3 years ago

Due today: How do you think the birds "predicted" Hurricanes

evablogger [386]

Research has shown that birds can hear infrasound (ref) and are sensitive to barometric pressure (ref and ref), so they know when a storm is on its way -- especially when the storm is as large and as powerful as a hurricane.Sep 8, 2017

8 0

3 years ago

1) What is the same in the Lithium atom and Lithium ion?

irakobra [83]

Becauseerter weyweywe ewrysetywr

7 0

3 years ago