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3 years ago

How are the elements in the current periodic table arranged

Chemistry

2 answers:

natka813 [3]3 years ago

6 0

Answer:

Elements in the periodic table are arranged from atomic number, increasing as you move more towards the right direction.

GenaCL600 [577]3 years ago

5 0

Answer:

by atomic number

Explanation:

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What strongly affects the movement of air masses along the earth's surface

Free_Kalibri [48]

The Earths rotation and the differences in air surface are two factors that affect the movement of air masses along the Earth's surface.

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3 years ago

Read 2 more answers

Two groups of students were given the same test. One group of students studied for 2 hours and the other group of students did n

gulaghasi [49]

Answer:

Grade achieved is the dependent variable in the study.

Explanation:

A variable in any research or study is any property, characteristic, number, or a quantity which shows variability or change in its value i.e. it increases or decreases over time, depending on the treatment conditions.

There are two types of variables: Dependent variable and Independent variable.

An independent variable does not depent on any factor for its value or result, rather, a change units value brings about a change in the dependent variable.

A dependent variable is the variable which depends on some factor which the researcher controls. Any change made on the factor by the researcher would bring about a change on the dependent variable.

For example, in the given example above, studying habit affects academic performance. If a student studies more, his/her academic performance will improve as they will achieve higher grades. On the other hand, if a student fails to study, their academic performance will not show any improvement when compared to the group of students who studied. Thus, grade improvement depends on studying habit.

Therefore, grade obtained is the dependent variable in the study.

5 0

3 years ago

Give the number of protons and the number of neutrons in the nucleus of each ofthe following isotopes: (a) Aluminum-25 (b) Techn

NeTakaya

Answer:(a)Aluminium-Al has 12 protons and 13neutrons (b) Technetium-Tc has 43 protons and 52neutrons (c) Tin-Sn has 50protons and 70 neutrons (d) Mercury - Hg has 80protons and 120neutrons

Explanation:

All elements on the periodic table are are arranged in terms of atomic number.

For a neutral atom( uncharged atom) , atomic number is the same as proton number. And the sum of number of proton and number of neutrons gives mass number.

Isotopes exist as a result of difference in mass number of atoms but the same atomic number, which implies isotopes of an element always have the same number of protons but different neutron numbers.

(a) Aluminum-25 has a mass number of 25 with atomic number of 12.

Since its a neutral atom, number of protons is 12 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 25-12=13neutrons

(b) Technetium -95 has a mass number of 95 with atomic number of 43.

Since its a neutral atom, number of protons is 12 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 95-43=52neutrons

Since its a neutral atom, number of protons is 50 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 120-50=70neutrons

(d) Mecury-200 has a mass number of 200 with atomic number of 80.

Since its a neutral atom, number of protons is 80 while neutron number can be deduced as,

Mass number = neutron number+ proton number

Neutron numbers= mass number - proton number

Neutron number= 200-80=120neutrons

7 0

4 years ago

Brainly.com

Inga [223]

The correct answer is 1.6 × 10¹⁰ .

The volume of ice chunk can be calculated by using the formula length × breadth × height

The length of the ice chunk given is 98 m, the breadth of the ice chunk given is 25 m and the thickness of the ice chunk given is 750 m,

= 98 × 25 × 750 × 0.000189

= 347.9 m³

= 3.831 × 10¹⁴ gal

Water in swimming pool is 24000 gal

Therefore, number of pools that can be filled = 3.831 × 10¹⁴ / 24000

= 1.596 × 10¹⁰

= 1.6 × 10¹⁰

3 0

4 years ago

A 78 g of Aluminium bar place in water. The initical water level was 132 ml and the final water level was 144 ml. Find the Volum

Effectus [21]

The volume is 12 mL (0.012 L)

Before the aluminum was added, the water reached 132mL. After it was added, it reached 144. That means the Aluminum takes up (144-132)= 12mL of space.

The density = mass/volume. If the aluminum bar has a mass of 78g and volume of 0.012L, 78/0.012=6,500 g/L

8 0

3 years ago