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
Sloan [31]
3 years ago
8

Group 7A of the periodic table contains the?

Physics
2 answers:
olga2289 [7]3 years ago
4 0

The correct answer is A. Most reactive non metals.

Firstly if some one knows how to read the periodic table he would have no confusion in deciding whether group 7 has metals or non metals. Group 7 contains non metals so basically we can easily cancel out two options of metals.

Secondly group 7 non metals are the most reactive non metals as they need only one electron in order to complete their valence shell and become stable.


olga_2 [115]3 years ago
3 0

The elements of group 7A are\boxed{{\text{most reactive non - metals}}}. Hence the correct option is\boxed{\text{1}}.

Further explanation:

Reactivity is defined as the tendency of the element to lose or gain an electron.

The reactivity trend of elements in the periodic table:

Across a period, the energy level remains same while the number of electrons increases. This causes the increase in nuclear charge of the atom and electrons strongly held by the nuclear forces. As a result, the reactivity of elements decreases from left to right.

Down the groups, the energy level increases while the number of electrons remains same. This causes a decrease in nuclear charge of the atom and electrons loosely held by the nuclear forces. As a result, the reactivity of elements increases from top to bottom.

In the periodic table, metals present in the left side, metalloid present in the middle, and the non-metals are present on the right side.

Since the group 7A is the 17th group of the periodic table and group 17th is present at the right side of the periodic table. Therefore, elements present in group 7A are non-metals.

Also, across the period reactivity of elements increases, therefore elements present at the most right are most reactive except noble gases. 17th is present at the most right side of the periodic table and thus elements present in group 7A are most reactive.

Hence the elements of group 7A are most reactive non-metals.

Learn more:

1.Determine the ion that represented by electronic configuration \left[ {{\text{Ar}}} \right]3{d^2}: brainly.com/question/7599542

2.Determine the reason that causes water molecule a bent shape: brainly.com/question/1979769

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Periodic table

Keywords: Periodic table, reactivity, metal reactivity, nonmetal reactivity, halogens, group, period and 7A.

You might be interested in
Calculate A, E, μ, cv and S for 1 mole of Kr at 298 K and 1 atm (assuming ideal behavior)
vaieri [72.5K]

Answer:

internal energy E 3716.35 j

cv = 12.47 J/K

S = 12.47 J/K

A =  0.29 J

\mu =3716.35 J/mole

Explanation:

given data:

Kr  atomic number = 36

degree of freedom = 3

1) internal energy E = \frac{f}{2} n R T

                                = \frac{3}{2} *1*8.314*298 = 3716.35 j

2) cv = \frac{E}{T}

         = \frac{3716.35}{298} = 12.47 J/K

3) S = cv =\frac{E}{T} = 12.47 J/K

4) A, Halmholtz free energy = E -TS = 37146.35 - 12.47*298 = 0.29 J

5)chemcial potential \mu = \frac{energy}{mole} = 3716.35 J/mole

6 0
3 years ago
Question 2
Ksivusya [100]

5.77 ×10^1^4 Hz is the green photon's frequency .

The distance between similar points (adjacent crests) in adjacent cycles of a waveform signal that is propagated in space is known as the wavelength. A wave's wavelength is often measured in meters (m), centimeters (cm), or millimeters (mm) (mm). The relationship between frequency and wavelength is inverse.

<h3>Given:</h3>

Wavelength of green light = 520 nm

f = c / λ

where, f = Frequency

            c = Speed of light = 3 × 10^8 m/s

            λ = Wavelength of light

∴ f = c / λ

  f = \frac{3*10^8}{520 * 10^-^9}

    = 5.77 ×10^1^4 Hz

Therefore,  5.77 ×10^1^4 Hz is the green photon's frequency .

Learn more about wavelength here:

brainly.com/question/10728818

#SPJ1

4 0
1 year ago
In terms of their location, what is the difference between subcutaneous fat and visceral fat
exis [7]
Subcutaneous fat is the fat that lies under the skin and isn’t necessarily harmful to your health and visceral fat is the harmful unseen fat surrounding the organs.
4 0
3 years ago
2. A rock is dropped off a bridge. How fast is the rock
zhenek [66]

Answer:

a) The velocity of rock at 1 second, v = 9.8 m/s

b) The velocity of rock at 3 second,  v = 29.4 m/s

c) The velocity of rock at 5.5 second,  v = 53.9 m/s

Explanation:

Given data,

The rock is dropped from a bridge.

The initial velocity of the rock, u = 0

a) The velocity of rock at 1 second,

   Using the first equation of motion

                         v = u + gt

                         v = 0 + 9.8 x 1

                          v = 9.8 m/s

b) The velocity of rock at 3 second,

                         v = u + gt

                         v = 0 + 9.8 x 3

                          v = 29.4 m/s

c) The velocity of rock at 5.5 second,

                         v = u + gt

                         v = 0 + 9.8 x 5.5

                         v = 53.9 m/s

5 0
3 years ago
A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of
OLEGan [10]

Answer:

c)F_{net} = 0.640 kN

Explanation:

As we know that resultant force is the net force that is acting on the system

As per Newton's II law we know that net force is product of mass and acceleration

so we will have

F_{net} = ma

here we know

m = 80 kg

for circular motion acceleration is given as

a_c = \frac{v^2}{R}

a_c = \frac{40^2}{200} = 8 m/s^2

now we have

F_{net} = 80 \times 8

F_{net} = 640 N

F_{net} = 0.640 kN

7 0
3 years ago
Other questions:
  • if a water wave vibrates up and down 4 times each second,the distance between 2 successive crest is 5 meters, and the height fro
    13·2 answers
  • Volcanoes are often formed at plate boundaries. This is a convergent plate boundary. From the choices listed, pick the correct d
    8·2 answers
  • What are the five natural agents of erosion? What is the driving force behind all of these agents of erosion?
    9·1 answer
  • A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, def
    6·1 answer
  • A solid metal sphere of diameter D is spinning in a gravity-free region of space with an angular velocity of ω. The sphere is sl
    7·1 answer
  • which one of the following will never happen when we use machine a force multiplication B innogy multiplication C is speed multi
    10·1 answer
  • What is the velocity of a rocket if it travels a distance of 2400 m in 3 s?
    11·1 answer
  • Select all of the statements that are true.
    12·1 answer
  • Which option is an example of a physical property?
    13·1 answer
  • A marble is thrown horizontally with a speed of 15.0 m/s from the top of a building. When it strikes the ground, the marble has
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!