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3 years ago

How many groups and periods are present in the periodic table?

Chemistry

2 answers:

PilotLPTM [1.2K]3 years ago

7 0

Answer:

Explanation:

There are seven periods in the periodic table, with each one beginning at the far left. A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements.

Elenna [48]3 years ago

6 0

Answer:

<h2>18 groups</h2>

In the periodic table, there are 7 periods and 18 groups.

Explanation:

#CARRY ON LEARNING

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3 years ago

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Answer:

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3 years ago

One atom of an element possesses 80 protons, 80 electrons, and 121 neutrons. Given this information, what is the atomic mass of

IRINA_888 [86]

Answer:

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Explanation:

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3 years ago

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Varvara68 [4.7K]

Answer:

This question contains a lot of subsections. Please find the variables to each question below

Explanation:

Hypothesis is a testable explanation to a scientific question. It aims at proffering a testable solution to an observed problem. It usually goes in an IF, THEN format.

Dependent variable is the variable being measured in an experiment, while the independent variable is the variable that is manipulated or changed by the experimenter.

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Control: Group given Black and White text to read

Constants: Same text

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Dependent variable: SPEED OF ANTS

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Constants: SAME KIND OF ANTS

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Independent variable: pH of soil

Dependent variable: Growth of strawberries

Control: Strawberries grown in a Neutral pH soil

Constants: Same type of plants (strawberries)

5. Hypothesis: IF caffeine is taken, then the blood pressure will be increased or raised.

Independent variable: CAFFEINE

Dependent variable: BLOOD PRESSURE

Control: Group given no caffeine

Constants: Same amount of caffeine

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Dependent variable: HEART RATE

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3 years ago

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OLga [1]

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3 years ago

How many groups and periods are present in the periodic table?​

How many groups and periods are present in the periodic table?