Answer:
Radium (Ra)
Explanation:
The nuclear fuel at Chernobyl was uranium-235. However, one of the decay products of uranium-235 is radium.
Radium is chemically similar to calcium since it has two valence electrons and is the heaviest and last member of group 2.
Owing to its chemical similarity to calcium, it was able to replace calcium in people's teeth and bones. Radium is radioactive, the half life of Ra-226 is about 1602 years.
Other elements of group 2 are; beryllium, magnesium, strontium and barium.
Mixtures
Explanation:
The forms of matter that exists without having chemical bonds between them are mixtures.
Mixtures are impure substances. They are made of matter that are not chemically bonded to one another.
Here are some of the characteristics of a mixture:
- Composition is indefinite i.e they consist of two or more elements and or compounds in any proportion by mass
- The constituents retain their identities i.e physical properties are not altered.
- The constituents reacts differently to changed conditions.
- They can easily be separated into constituents by physical methods.
Many natural mixtures exists and several others can be formulated. Examples include air, sea-water, muddy water, alloys e.t.c
learn more:
Mixture brainly.com/question/1446244
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Explanation:
Given parameters
Period = 2.34minutes
Unknown:
Frequency of the oscillator = ?
Solution:
Frequency is the number of waves that passes through a point at a given time. It is the inverse of period which is the time it takes for a wave to pass through a medium:
F = 
F is the frequency
T is the period
To solve this, convert the period to seconds:
2.34minutes to seconds:
1 min = 60seconds
2.34 = 60 x 2.34 = 140.4s
F =
= 0.007hz or 0.007s⁻¹
Learn more:
frequency brainly.com/question/5882803
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huh that's suspicious that's weird