All categories

3 years ago

In the periodic table, the period number indicates

Chemistry

2 answers:

yaroslaw [1]3 years ago

5 0

D. the number of outermost energy level for elements in that period.

Mariulka [41]3 years ago

3 0

A. the number dots shown on the lewis dot diagrams for the element in the period

You might be interested in

Explain examples of a physical and chemical change of matter

monitta

HEY DEAR..

PHYSICAL CHANGE

Those Changes in which no new substances are formed are called physical changes. it is a temporary changes which can be reversed easily to form the original substance.

Example:- Melting of ice , Making a solution, Glowing of an electric bulb , freezing of water etc.

CHEMICAL CHANGE

Those changes in which new substances are formed are called chemical changes. it means it is permanent changes which are usually irreversible.

Example:- Burning of charcoal, fuels and cutting of trees, even digestion of food is in chemical change.

HOPE ITS HELPFULLL

BE BRAINLY.

6 0

3 years ago

Which practice does the Montreal Protocol aim to reduce?

PolarNik [594]

Ozone which is present in the stratospheric region of atmosphere is helpful for preventing harmful UV rays from reaching the surface of earth. Due to human activity, several compounds (specifically chlorofluorocarbons) are released in atmosphere. Due to inherent chemical stability of these compounds, the remain stable in lower region of atmosphere and slowly diffuse into stratosphere. On reaching the stratosphere, these compounds reacts with ozone and thereby depletes the effective concentration of ozone present in atmosphere. Hence, the Montreal Protocol was signed in 1987 by major countries of the world. This aim of this protocol was to protect the stratospheric ozone layer by phasing out the production and consumption of ozone-depleting substances.

6 0

3 years ago

Read 2 more answers

Which atom is a carbon atom? A B C

Illusion [34]

B
Hope I helped :) shajs

3 0

3 years ago

The solubility of an ionic compound can be expressed as the number of moles of the compound that will dissolve per liter of solu

Law Incorporation [45]

Answer:

Number of moles of sodium dissolved = 6.0 *10^23

Explanation:

The image for the question is attached

Solution

a) Total 181 ions of Na are dissolved

The number of moles of sodium dissolved = 181/6.023 *10^23

Number of moles of sodium dissolved = 5.987 * 10^23

Number of moles of sodium dissolved = 6.0 *10^23

5 0

2 years ago

An unknown metal absorbs 61 J of heat, and its temperature increases by 29∘C. What is the heat capacity of the metal?

aniked [119]

Answer:

2.103 J/C

Explanation:

Quantity of heat = Heat Capacity * Temperature change

Heat Capacity = Quantity of heat / Temperature Change

Heat Capacity = 61/29

Heat Capacity = 2.103 J/C

3 0

3 years ago