Exam 2: Atoms and Elements

Calculate the atomic mass of silver if silver has two naturally occurring isotopes with the following masses and natural abundances: Ag-107 $\quad$ 106.90509 u $\quad$ 51.84% Ag-109 $\quad$ 108.90476 u $\quad$ 48.46%

Why do the isotopes of the same element have the same atomic size?

Which of the following elements is a noble gas?

Which of the following elements is an alkali metal?

Identify the number of protons in P^-3.

In which of the following sets do all species have the same number of electrons?

In a 41.5 g sample of carbon,how many atoms have a mass of 12.0107 u?

How many moles are in one dozen?

Determine the number of protons,neutrons,and electrons in the following: ${ } _ { 12 } ^ { 25 } \mathrm { X }$

Predict the charge that an ion formed from sulfur would have.

Give the name of the element whose symbol is Na.

Zinc has five naturally occurring isotopes,Zn-64,Zn-66,Zn-67,Zn-68 and Zn-70.Calculate the atomic mass of zinc given the following abundances and atomic masses for the isotopes: Zn-64 $\quad$ 63.9291 u $\quad$ 48.61% Zn-66 $\quad$ 65.9260 u $\quad$ 27.9% Zn-67 $\quad$ 66.9271 u $\quad$ 4.1% Zn-68 $\quad$ 67.9248 u $\quad$ 18.75% Zn-70 $\quad$ 69.9253 u $\quad$ 0.62%

If 8.32 g of copper is mixed with 5.2372 × 10^-2 mol of zinc to create the alloy brass,how many metal atoms total are present in the brass?

What does "X" represent in the following symbol? ${ } _ { 92 } ^ { 235 } \mathrm { X }$

Which of the following is a transition element?

What mass (in g)does 3.99 moles of Kr have?

How many silver atoms are contained in 3.75 moles of silver?

How many neutrons are in arsenic-42?

An atom of ¹⁷F contains ________ electrons.

What is the chemical symbol for titanium?