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2 years ago

Which statement is true about elements in a period on the periodic table?

Chemistry

2 answers:

frozen [14]2 years ago

5 0

Answer:

they have differnet properties that repeat across the next period

Explanation:

lara31 [8.8K]2 years ago

3 0

Answer: They have different properties that repeat across the next period

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements in period are arranged in order of increasing atomic numbers, thus have different valence electrons and thus have different properties.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.

Thus as the elements are arranged such that the elements with similar chemical properties occur after a regular interval, it is true that the elements in the period have different properties that repeat across the next period.

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Solid iron metal reacts with solid sulfur at room temperature to produce solid iron (ll) sulfide? Express as a chemical equation

kupik [55]

Answer:Fe+S=FeS

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2 years ago

Which of the following are indicators of a chemical change? Select all that apply.

Arturiano [62]

<span>Which of the following are indicators of a chemical change? Select all that apply.
</span>
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<span>color change
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2 years ago

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A vial containing radioactive selenium-75 has an activity of 3.0 mCi/mL. If 2.6 mCi are required for a leukemia test, how many m

oksian1 [2.3K]

Answer : The $866.66\mu L$ must be administered.

Solution :

As we are given that a vial containing radioactive selenium-75 has an activity of $3.0mCi/mL$ .

As, 3.0 mCi radioactive selenium-75 present in 1 ml

So, 2.6 mCi radioactive selenium-75 present in $\frac{2.6mCi}{3.0mCi}\times 1ml=0.86666ml\times 1000=866.66\mu L$

Conversion :

$(1ml=1000\mu L)$

Therefore, the $866.66\mu L$ must be administered.

4 0

2 years ago

The last element in any period always has:

brilliants [131]

Answer: The correct option is The properties of a noble gas.

Explanation: There are 7 periods in the periodic table.

The last element of each period are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) and Ununoctium (Uuo).

The electronic configuration for Helium is $1s^2$ . For He, The outermost electrons are 2.

The electronic configuration for all the other elements is $ns^2ns^6$ ( where, n = 2, 3, 4, 5, 6 and 7 respectively). For all the other gases, the outermost electrons are 8.

All these elements have stable electronic configuration and are not reactive in nature. Hence, they are considered as noble gases.

Therefore, the last element of each period always have the properties of a noble gas.

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In physical change the make up of matter is changedWho or false

Harrizon [31]

Answer:

False

That is a chemical change

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2 years ago

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