Periodic Table

An atom of tungsten (W) has 74 protons. The atomic mass of tungsten is 183.84. How many neutrons does an atom of tungsten have? Round your answer to the nearest whole number.

110

76 Os Osmium 190.23 Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium

114

The atomic number of cesium (Cs) is 55. If an atom of cesium has 78 neutrons, what is the atomic mass of cesium?

133

36 Kr Krypton 83.80 Rounded to the nearest whole number, how many protons are in an atom of krypton?

36

Zirconium - 40 Zr 91.22 Rounded to the nearest whole number, how many electrons are in an atom of zirconium?

40

Which statement accurately compares the trends in atomic number and atomic mass in the periodic table?

Both the atomic mass and the atomic number increase from left to right.

Which scientist arranged the elements in order of increasing atomic number, rather than increasing atomic mass

Henry Moseley

Which two chemists organized elements based on properties such as how the elements react or whether they are solid or liquid?

Lavoisier and Döbereiner

Which statements accurately describe Dmitri Mendeleev's contributions to the development of the periodic table? Check all that apply.

Mendeleev produced the first orderly arrangement of known elements. Mendeleev used patterns to predict undiscovered elements.

In an element's square on the periodic table, the number with the greatest numerical value represents the

atomic mass

While looking at calcium (Ca) on the periodic table, a student needs to find an element with a greater atomic mass in the same period. Where should the student look?

directly to the right

What are 1A, 3B, and 7A examples of on the periodic table?

groups

The element aluminum (Al) is outlined in red on the periodic table. Which period number is aluminum? Which group number is aluminum in?

period number 3 group number 13

Element- 50 Tin 118.71 Sn How many protons How many electrons How many neutrons, (round to nearest whole number)

protons 50 electrons 50 neutrons 69

tin antimony tellurium iodine Which element's atoms have the greatest average number of neutrons

tellurium

Atoms of elements in the same group have the same number of ______ . This is why they have similar chemical properties.

valence electrons

Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

which chemical properties they have